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thread.c

/*
 * NT threads support
 *
 * Copyright 1996, 2003 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"
#include "wine/port.h"

#include <assert.h>
#include <stdarg.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif

#define NONAMELESSUNION
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "wine/library.h"
#include "wine/server.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
#include "ddk/wdm.h"
#include "wine/exception.h"

WINE_DEFAULT_DEBUG_CHANNEL(thread);
WINE_DECLARE_DEBUG_CHANNEL(relay);

struct _KUSER_SHARED_DATA *user_shared_data = NULL;

PUNHANDLED_EXCEPTION_FILTER unhandled_exception_filter = NULL;

/* info passed to a starting thread */
struct startup_info
{
    TEB                            *teb;
    PRTL_THREAD_START_ROUTINE       entry_point;
    void                           *entry_arg;
};

static PEB_LDR_DATA ldr;
static RTL_USER_PROCESS_PARAMETERS params;  /* default parameters if no parent */
static WCHAR current_dir[MAX_NT_PATH_LENGTH];
static RTL_BITMAP tls_bitmap;
static RTL_BITMAP tls_expansion_bitmap;
static RTL_BITMAP fls_bitmap;
static LIST_ENTRY tls_links;
static size_t sigstack_total_size;
static ULONG sigstack_zero_bits;
static int nb_threads = 1;

static RTL_CRITICAL_SECTION ldt_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
    0, 0, &ldt_section,
    { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
};
static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static sigset_t ldt_sigset;

/***********************************************************************
 *           locking for LDT routines
 */
static void ldt_lock(void)
{
    sigset_t sigset;

    pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
    RtlEnterCriticalSection( &ldt_section );
    if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
}

static void ldt_unlock(void)
{
    if (ldt_section.RecursionCount == 1)
    {
        sigset_t sigset = ldt_sigset;
        RtlLeaveCriticalSection( &ldt_section );
        pthread_sigmask( SIG_SETMASK, &sigset, NULL );
    }
    else RtlLeaveCriticalSection( &ldt_section );
}


/***********************************************************************
 *           init_teb
 */
static inline NTSTATUS init_teb( TEB *teb )
{
    struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;

    teb->Tib.ExceptionList = (void *)~0UL;
    teb->Tib.StackBase     = (void *)~0UL;
    teb->Tib.Self          = &teb->Tib;
    teb->StaticUnicodeString.Buffer        = teb->StaticUnicodeBuffer;
    teb->StaticUnicodeString.MaximumLength = sizeof(teb->StaticUnicodeBuffer);

    if (!(thread_data->fs = wine_ldt_alloc_fs())) return STATUS_TOO_MANY_THREADS;
    thread_data->request_fd = -1;
    thread_data->reply_fd   = -1;
    thread_data->wait_fd[0] = -1;
    thread_data->wait_fd[1] = -1;

    return STATUS_SUCCESS;
}


/***********************************************************************
 *           get_unicode_string
 *
 * Copy a unicode string from the startup info.
 */
static inline void get_unicode_string( UNICODE_STRING *str, WCHAR **src, WCHAR **dst, UINT len )
{
    str->Buffer = *dst;
    str->Length = len;
    str->MaximumLength = len + sizeof(WCHAR);
    memcpy( str->Buffer, *src, len );
    str->Buffer[len / sizeof(WCHAR)] = 0;
    *src += len / sizeof(WCHAR);
    *dst += len / sizeof(WCHAR) + 1;
}

/***********************************************************************
 *           init_user_process_params
 *
 * Fill the RTL_USER_PROCESS_PARAMETERS structure from the server.
 */
static NTSTATUS init_user_process_params( SIZE_T data_size, HANDLE *exe_file )
{
    void *ptr;
    WCHAR *src, *dst;
    SIZE_T info_size, env_size, size, alloc_size;
    NTSTATUS status;
    startup_info_t *info;
    RTL_USER_PROCESS_PARAMETERS *params = NULL;

    if (!(info = RtlAllocateHeap( GetProcessHeap(), 0, data_size )))
        return STATUS_NO_MEMORY;

    SERVER_START_REQ( get_startup_info )
    {
        wine_server_set_reply( req, info, data_size );
        if (!(status = wine_server_call( req )))
        {
            data_size = wine_server_reply_size( reply );
            info_size = reply->info_size;
            env_size  = data_size - info_size;
            *exe_file = wine_server_ptr_handle( reply->exe_file );
        }
    }
    SERVER_END_REQ;
    if (status != STATUS_SUCCESS) goto done;

    size = sizeof(*params);
    size += MAX_NT_PATH_LENGTH * sizeof(WCHAR);
    size += info->dllpath_len + sizeof(WCHAR);
    size += info->imagepath_len + sizeof(WCHAR);
    size += info->cmdline_len + sizeof(WCHAR);
    size += info->title_len + sizeof(WCHAR);
    size += info->desktop_len + sizeof(WCHAR);
    size += info->shellinfo_len + sizeof(WCHAR);
    size += info->runtime_len + sizeof(WCHAR);

    alloc_size = size;
    status = NtAllocateVirtualMemory( NtCurrentProcess(), (void **)&params, 0, &alloc_size,
                                      MEM_COMMIT, PAGE_READWRITE );
    if (status != STATUS_SUCCESS) goto done;

    NtCurrentTeb()->Peb->ProcessParameters = params;
    params->AllocationSize  = alloc_size;
    params->Size            = size;
    params->Flags           = PROCESS_PARAMS_FLAG_NORMALIZED;
    params->DebugFlags      = info->debug_flags;
    params->ConsoleHandle   = wine_server_ptr_handle( info->console );
    params->ConsoleFlags    = info->console_flags;
    params->hStdInput       = wine_server_ptr_handle( info->hstdin );
    params->hStdOutput      = wine_server_ptr_handle( info->hstdout );
    params->hStdError       = wine_server_ptr_handle( info->hstderr );
    params->dwX             = info->x;
    params->dwY             = info->y;
    params->dwXSize         = info->xsize;
    params->dwYSize         = info->ysize;
    params->dwXCountChars   = info->xchars;
    params->dwYCountChars   = info->ychars;
    params->dwFillAttribute = info->attribute;
    params->dwFlags         = info->flags;
    params->wShowWindow     = info->show;

    src = (WCHAR *)(info + 1);
    dst = (WCHAR *)(params + 1);

    /* current directory needs more space */
    get_unicode_string( &params->CurrentDirectory.DosPath, &src, &dst, info->curdir_len );
    params->CurrentDirectory.DosPath.MaximumLength = MAX_NT_PATH_LENGTH * sizeof(WCHAR);
    dst = (WCHAR *)(params + 1) + MAX_NT_PATH_LENGTH;

    get_unicode_string( &params->DllPath, &src, &dst, info->dllpath_len );
    get_unicode_string( &params->ImagePathName, &src, &dst, info->imagepath_len );
    get_unicode_string( &params->CommandLine, &src, &dst, info->cmdline_len );
    get_unicode_string( &params->WindowTitle, &src, &dst, info->title_len );
    get_unicode_string( &params->Desktop, &src, &dst, info->desktop_len );
    get_unicode_string( &params->ShellInfo, &src, &dst, info->shellinfo_len );

    /* runtime info isn't a real string */
    params->RuntimeInfo.Buffer = dst;
    params->RuntimeInfo.Length = params->RuntimeInfo.MaximumLength = info->runtime_len;
    memcpy( dst, src, info->runtime_len );

    /* environment needs to be a separate memory block */
    ptr = NULL;
    alloc_size = max( 1, env_size );
    status = NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0, &alloc_size,
                                      MEM_COMMIT, PAGE_READWRITE );
    if (status != STATUS_SUCCESS) goto done;
    memcpy( ptr, (char *)info + info_size, env_size );
    params->Environment = ptr;

done:
    RtlFreeHeap( GetProcessHeap(), 0, info );
    return status;
}


/***********************************************************************
 *           thread_init
 *
 * Setup the initial thread.
 *
 * NOTES: The first allocated TEB on NT is at 0x7ffde000.
 */
HANDLE thread_init(void)
{
    PEB *peb;
    TEB *teb;
    void *addr;
    SIZE_T size, info_size;
    HANDLE exe_file = 0;
    LARGE_INTEGER now;
    struct ntdll_thread_data *thread_data;
    static struct debug_info debug_info;  /* debug info for initial thread */

    virtual_init();

    /* reserve space for shared user data */

    addr = (void *)0x7ffe0000;
    size = 0x10000;
    NtAllocateVirtualMemory( NtCurrentProcess(), &addr, 0, &size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE );
    user_shared_data = addr;

    /* allocate and initialize the PEB */

    addr = NULL;
    size = sizeof(*peb);
    NtAllocateVirtualMemory( NtCurrentProcess(), &addr, 1, &size,
                             MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE );
    peb = addr;

    peb->NumberOfProcessors = 1;
    peb->ProcessParameters  = &params;
    peb->TlsBitmap          = &tls_bitmap;
    peb->TlsExpansionBitmap = &tls_expansion_bitmap;
    peb->FlsBitmap          = &fls_bitmap;
    peb->LdrData            = &ldr;
    params.CurrentDirectory.DosPath.Buffer = current_dir;
    params.CurrentDirectory.DosPath.MaximumLength = sizeof(current_dir);
    params.wShowWindow = 1; /* SW_SHOWNORMAL */
    RtlInitializeBitMap( &tls_bitmap, peb->TlsBitmapBits, sizeof(peb->TlsBitmapBits) * 8 );
    RtlInitializeBitMap( &tls_expansion_bitmap, peb->TlsExpansionBitmapBits,
                         sizeof(peb->TlsExpansionBitmapBits) * 8 );
    RtlInitializeBitMap( &fls_bitmap, peb->FlsBitmapBits, sizeof(peb->FlsBitmapBits) * 8 );
    InitializeListHead( &peb->FlsListHead );
    InitializeListHead( &ldr.InLoadOrderModuleList );
    InitializeListHead( &ldr.InMemoryOrderModuleList );
    InitializeListHead( &ldr.InInitializationOrderModuleList );
    InitializeListHead( &tls_links );

    /* allocate and initialize the initial TEB */

    sigstack_total_size = get_signal_stack_total_size();
    while (1U << sigstack_zero_bits < sigstack_total_size) sigstack_zero_bits++;
    assert( 1U << sigstack_zero_bits == sigstack_total_size );  /* must be a power of 2 */
    assert( sigstack_total_size >= sizeof(TEB) + sizeof(struct startup_info) );

    addr = NULL;
    size = sigstack_total_size;
    NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
                             &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE );
    teb = addr;
    teb->Peb = peb;
    init_teb( teb );
    thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
    thread_data->debug_info = &debug_info;
    InsertHeadList( &tls_links, &teb->TlsLinks );

    signal_init_thread( teb );
    virtual_init_threading();

    debug_info.str_pos = debug_info.strings;
    debug_info.out_pos = debug_info.output;
    debug_init();

    /* setup the server connection */
    server_init_process();
    info_size = server_init_thread( peb );

    /* create the process heap */
    if (!(peb->ProcessHeap = RtlCreateHeap( HEAP_GROWABLE, NULL, 0, 0, NULL, NULL )))
    {
        MESSAGE( "wine: failed to create the process heap\n" );
        exit(1);
    }

    /* allocate user parameters */
    if (info_size)
    {
        init_user_process_params( info_size, &exe_file );
    }
    else
    {
        /* This is wine specific: we have no parent (we're started from unix)
         * so, create a simple console with bare handles to unix stdio
         */
        wine_server_fd_to_handle( 0, GENERIC_READ|SYNCHRONIZE,  OBJ_INHERIT, &params.hStdInput );
        wine_server_fd_to_handle( 1, GENERIC_WRITE|SYNCHRONIZE, OBJ_INHERIT, &params.hStdOutput );
        wine_server_fd_to_handle( 2, GENERIC_WRITE|SYNCHRONIZE, OBJ_INHERIT, &params.hStdError );
    }

    /* initialize LDT locking */
    wine_ldt_init_locking( ldt_lock, ldt_unlock );

    /* initialize time values in user_shared_data */
    NtQuerySystemTime( &now );
    user_shared_data->SystemTime.LowPart = now.u.LowPart;
    user_shared_data->SystemTime.High1Time = user_shared_data->SystemTime.High2Time = now.u.HighPart;
    user_shared_data->u.TickCountQuad = (now.QuadPart - server_start_time) / 10000;
    user_shared_data->u.TickCount.High2Time = user_shared_data->u.TickCount.High1Time;
    user_shared_data->TickCountLowDeprecated = user_shared_data->u.TickCount.LowPart;
    user_shared_data->TickCountMultiplier = 1 << 24;

    return exe_file;
}


/***********************************************************************
 *           terminate_thread
 */
void terminate_thread( int status )
{
    pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
    if (interlocked_xchg_add( &nb_threads, -1 ) <= 1) _exit( status );

    close( ntdll_get_thread_data()->wait_fd[0] );
    close( ntdll_get_thread_data()->wait_fd[1] );
    close( ntdll_get_thread_data()->reply_fd );
    close( ntdll_get_thread_data()->request_fd );
    pthread_exit( UIntToPtr(status) );
}


/***********************************************************************
 *           exit_thread
 */
void exit_thread( int status )
{
    static void *prev_teb;
    TEB *teb;

    if (status)  /* send the exit code to the server (0 is already the default) */
    {
        SERVER_START_REQ( terminate_thread )
        {
            req->handle    = wine_server_obj_handle( GetCurrentThread() );
            req->exit_code = status;
            wine_server_call( req );
        }
        SERVER_END_REQ;
    }

    if (interlocked_xchg_add( &nb_threads, -1 ) <= 1)
    {
        LdrShutdownProcess();
        exit( status );
    }

    LdrShutdownThread();
    RtlAcquirePebLock();
    RemoveEntryList( &NtCurrentTeb()->TlsLinks );
    RtlReleasePebLock();
    RtlFreeHeap( GetProcessHeap(), 0, NtCurrentTeb()->FlsSlots );
    RtlFreeHeap( GetProcessHeap(), 0, NtCurrentTeb()->TlsExpansionSlots );

    pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );

    if ((teb = interlocked_xchg_ptr( &prev_teb, NtCurrentTeb() )))
    {
        struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
        SIZE_T size;

        pthread_join( thread_data->pthread_id, NULL );
        wine_ldt_free_fs( thread_data->fs );
        size = 0;
        NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
        size = 0;
        NtFreeVirtualMemory( GetCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
    }

    close( ntdll_get_thread_data()->wait_fd[0] );
    close( ntdll_get_thread_data()->wait_fd[1] );
    close( ntdll_get_thread_data()->reply_fd );
    close( ntdll_get_thread_data()->request_fd );
    pthread_exit( UIntToPtr(status) );
}


/***********************************************************************
 *           start_thread
 *
 * Startup routine for a newly created thread.
 */
static void start_thread( struct startup_info *info )
{
    TEB *teb = info->teb;
    struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
    PRTL_THREAD_START_ROUTINE func = info->entry_point;
    void *arg = info->entry_arg;
    struct debug_info debug_info;

    debug_info.str_pos = debug_info.strings;
    debug_info.out_pos = debug_info.output;
    thread_data->debug_info = &debug_info;
    thread_data->pthread_id = pthread_self();

    signal_init_thread( teb );
    server_init_thread( func );
    pthread_sigmask( SIG_UNBLOCK, &server_block_set, NULL );

    RtlAcquirePebLock();
    InsertHeadList( &tls_links, &teb->TlsLinks );
    RtlReleasePebLock();

    MODULE_DllThreadAttach( NULL );

    if (TRACE_ON(relay))
        DPRINTF( "%04x:Starting thread proc %p (arg=%p)\n", GetCurrentThreadId(), func, arg );

    call_thread_entry_point( (LPTHREAD_START_ROUTINE)func, arg );
}


/***********************************************************************
 *              RtlCreateUserThread   (NTDLL.@)
 */
NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, const SECURITY_DESCRIPTOR *descr,
                                     BOOLEAN suspended, PVOID stack_addr,
                                     SIZE_T stack_reserve, SIZE_T stack_commit,
                                     PRTL_THREAD_START_ROUTINE start, void *param,
                                     HANDLE *handle_ptr, CLIENT_ID *id )
{
    sigset_t sigset;
    pthread_t pthread_id;
    pthread_attr_t attr;
    struct ntdll_thread_data *thread_data = NULL;
    struct ntdll_thread_regs *thread_regs;
    struct startup_info *info = NULL;
    void *addr = NULL;
    HANDLE handle = 0;
    TEB *teb;
    DWORD tid = 0;
    int request_pipe[2];
    NTSTATUS status;
    SIZE_T size;

    if (process != NtCurrentProcess())
    {
        apc_call_t call;
        apc_result_t result;

        memset( &call, 0, sizeof(call) );

        call.create_thread.type    = APC_CREATE_THREAD;
        call.create_thread.func    = wine_server_client_ptr( start );
        call.create_thread.arg     = wine_server_client_ptr( param );
        call.create_thread.reserve = stack_reserve;
        call.create_thread.commit  = stack_commit;
        call.create_thread.suspend = suspended;
        status = NTDLL_queue_process_apc( process, &call, &result );
        if (status != STATUS_SUCCESS) return status;

        if (result.create_thread.status == STATUS_SUCCESS)
        {
            if (id) id->UniqueThread = ULongToHandle(result.create_thread.tid);
            if (handle_ptr) *handle_ptr = wine_server_ptr_handle( result.create_thread.handle );
            else NtClose( wine_server_ptr_handle( result.create_thread.handle ));
        }
        return result.create_thread.status;
    }

    if (server_pipe( request_pipe ) == -1) return STATUS_TOO_MANY_OPENED_FILES;
    wine_server_send_fd( request_pipe[0] );

    SERVER_START_REQ( new_thread )
    {
        req->access     = THREAD_ALL_ACCESS;
        req->attributes = 0;  /* FIXME */
        req->suspend    = suspended;
        req->request_fd = request_pipe[0];
        if (!(status = wine_server_call( req )))
        {
            handle = wine_server_ptr_handle( reply->handle );
            tid = reply->tid;
        }
        close( request_pipe[0] );
    }
    SERVER_END_REQ;

    if (status)
    {
        close( request_pipe[1] );
        return status;
    }

    pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );

    addr = NULL;
    size = sigstack_total_size;
    if ((status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
                                           &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
        goto error;
    teb = addr;
    teb->Peb = NtCurrentTeb()->Peb;
    info = (struct startup_info *)(teb + 1);
    info->teb         = teb;
    info->entry_point = start;
    info->entry_arg   = param;

    if ((status = init_teb( teb ))) goto error;

    teb->ClientId.UniqueProcess = ULongToHandle(GetCurrentProcessId());
    teb->ClientId.UniqueThread  = ULongToHandle(tid);

    thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
    thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1;
    thread_data->request_fd  = request_pipe[1];

    /* inherit debug registers from parent thread */
    thread_regs->dr0 = ntdll_get_thread_regs()->dr0;
    thread_regs->dr1 = ntdll_get_thread_regs()->dr1;
    thread_regs->dr2 = ntdll_get_thread_regs()->dr2;
    thread_regs->dr3 = ntdll_get_thread_regs()->dr3;
    thread_regs->dr6 = ntdll_get_thread_regs()->dr6;
    thread_regs->dr7 = ntdll_get_thread_regs()->dr7;

    if ((status = virtual_alloc_thread_stack( teb, stack_reserve, stack_commit ))) goto error;

    pthread_attr_init( &attr );
    pthread_attr_setstack( &attr, teb->DeallocationStack,
                           (char *)teb->Tib.StackBase - (char *)teb->DeallocationStack );
    pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM ); /* force creating a kernel thread */
    interlocked_xchg_add( &nb_threads, 1 );
    if (pthread_create( &pthread_id, &attr, (void * (*)(void *))start_thread, info ))
    {
        interlocked_xchg_add( &nb_threads, -1 );
        pthread_attr_destroy( &attr );
        size = 0;
        NtFreeVirtualMemory( NtCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
        status = STATUS_NO_MEMORY;
        goto error;
    }
    pthread_attr_destroy( &attr );
    pthread_sigmask( SIG_SETMASK, &sigset, NULL );

    if (id) id->UniqueThread = ULongToHandle(tid);
    if (handle_ptr) *handle_ptr = handle;
    else NtClose( handle );

    return STATUS_SUCCESS;

error:
    if (thread_data) wine_ldt_free_fs( thread_data->fs );
    if (addr)
    {
        size = 0;
        NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
    }
    if (handle) NtClose( handle );
    pthread_sigmask( SIG_SETMASK, &sigset, NULL );
    close( request_pipe[1] );
    return status;
}


/***********************************************************************
 *              NtOpenThread   (NTDLL.@)
 *              ZwOpenThread   (NTDLL.@)
 */
NTSTATUS WINAPI NtOpenThread( HANDLE *handle, ACCESS_MASK access,
                              const OBJECT_ATTRIBUTES *attr, const CLIENT_ID *id )
{
    NTSTATUS ret;

    SERVER_START_REQ( open_thread )
    {
        req->tid        = HandleToULong(id->UniqueThread);
        req->access     = access;
        req->attributes = attr ? attr->Attributes : 0;
        ret = wine_server_call( req );
        *handle = wine_server_ptr_handle( reply->handle );
    }
    SERVER_END_REQ;
    return ret;
}


/******************************************************************************
 *              NtSuspendThread   (NTDLL.@)
 *              ZwSuspendThread   (NTDLL.@)
 */
NTSTATUS WINAPI NtSuspendThread( HANDLE handle, PULONG count )
{
    NTSTATUS ret;

    SERVER_START_REQ( suspend_thread )
    {
        req->handle = wine_server_obj_handle( handle );
        if (!(ret = wine_server_call( req ))) *count = reply->count;
    }
    SERVER_END_REQ;
    return ret;
}


/******************************************************************************
 *              NtResumeThread   (NTDLL.@)
 *              ZwResumeThread   (NTDLL.@)
 */
NTSTATUS WINAPI NtResumeThread( HANDLE handle, PULONG count )
{
    NTSTATUS ret;

    SERVER_START_REQ( resume_thread )
    {
        req->handle = wine_server_obj_handle( handle );
        if (!(ret = wine_server_call( req ))) *count = reply->count;
    }
    SERVER_END_REQ;
    return ret;
}


/******************************************************************************
 *              NtAlertResumeThread   (NTDLL.@)
 *              ZwAlertResumeThread   (NTDLL.@)
 */
NTSTATUS WINAPI NtAlertResumeThread( HANDLE handle, PULONG count )
{
    FIXME( "stub: should alert thread %p\n", handle );
    return NtResumeThread( handle, count );
}


/******************************************************************************
 *              NtAlertThread   (NTDLL.@)
 *              ZwAlertThread   (NTDLL.@)
 */
NTSTATUS WINAPI NtAlertThread( HANDLE handle )
{
    FIXME( "stub: %p\n", handle );
    return STATUS_NOT_IMPLEMENTED;
}


/******************************************************************************
 *              NtTerminateThread  (NTDLL.@)
 *              ZwTerminateThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtTerminateThread( HANDLE handle, LONG exit_code )
{
    NTSTATUS ret;
    BOOL self;

    SERVER_START_REQ( terminate_thread )
    {
        req->handle    = wine_server_obj_handle( handle );
        req->exit_code = exit_code;
        ret = wine_server_call( req );
        self = !ret && reply->self;
    }
    SERVER_END_REQ;

    if (self) abort_thread( exit_code );
    return ret;
}


/******************************************************************************
 *              NtQueueApcThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtQueueApcThread( HANDLE handle, PNTAPCFUNC func, ULONG_PTR arg1,
                                  ULONG_PTR arg2, ULONG_PTR arg3 )
{
    NTSTATUS ret;
    SERVER_START_REQ( queue_apc )
    {
        req->handle = wine_server_obj_handle( handle );
        if (func)
        {
            req->call.type         = APC_USER;
            req->call.user.func    = wine_server_client_ptr( func );
            req->call.user.args[0] = arg1;
            req->call.user.args[1] = arg2;
            req->call.user.args[2] = arg3;
        }
        else req->call.type = APC_NONE;  /* wake up only */
        ret = wine_server_call( req );
    }
    SERVER_END_REQ;
    return ret;
}


/***********************************************************************
 *              NtSetContextThread  (NTDLL.@)
 *              ZwSetContextThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtSetContextThread( HANDLE handle, const CONTEXT *context )
{
    NTSTATUS ret;
    DWORD dummy, i;
    BOOL self = FALSE;

#ifdef __i386__
    /* on i386 debug registers always require a server call */
    self = (handle == GetCurrentThread());
    if (self && (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)))
    {
        struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
        self = (regs->dr0 == context->Dr0 && regs->dr1 == context->Dr1 &&
                regs->dr2 == context->Dr2 && regs->dr3 == context->Dr3 &&
                regs->dr6 == context->Dr6 && regs->dr7 == context->Dr7);
    }
#endif

    if (!self)
    {
        context_t server_context;

        context_to_server( &server_context, context );

        SERVER_START_REQ( set_thread_context )
        {
            req->handle  = wine_server_obj_handle( handle );
            req->suspend = 0;
            wine_server_add_data( req, &server_context, sizeof(server_context) );
            ret = wine_server_call( req );
            self = reply->self;
        }
        SERVER_END_REQ;

        if (ret == STATUS_PENDING)
        {
            if (NtSuspendThread( handle, &dummy ) == STATUS_SUCCESS)
            {
                for (i = 0; i < 100; i++)
                {
                    SERVER_START_REQ( set_thread_context )
                    {
                        req->handle  = wine_server_obj_handle( handle );
                        req->suspend = 0;
                        wine_server_add_data( req, &server_context, sizeof(server_context) );
                        ret = wine_server_call( req );
                    }
                    SERVER_END_REQ;
                    if (ret == STATUS_PENDING)
                    {
                        LARGE_INTEGER timeout;
                        timeout.QuadPart = -10000;
                        NtDelayExecution( FALSE, &timeout );
                    }
                    else break;
                }
                NtResumeThread( handle, &dummy );
            }
            if (ret == STATUS_PENDING) ret = STATUS_ACCESS_DENIED;
        }

        if (ret) return ret;
    }

    if (self) set_cpu_context( context );
    return STATUS_SUCCESS;
}


/* convert CPU-specific flags to generic server flags */
static inline unsigned int get_server_context_flags( DWORD flags )
{
    unsigned int ret = 0;

    flags &= 0x3f;  /* mask CPU id flags */
    if (flags & CONTEXT_CONTROL) ret |= SERVER_CTX_CONTROL;
    if (flags & CONTEXT_INTEGER) ret |= SERVER_CTX_INTEGER;
#ifdef CONTEXT_SEGMENTS
    if (flags & CONTEXT_SEGMENTS) ret |= SERVER_CTX_SEGMENTS;
#endif
#ifdef CONTEXT_FLOATING_POINT
    if (flags & CONTEXT_FLOATING_POINT) ret |= SERVER_CTX_FLOATING_POINT;
#endif
#ifdef CONTEXT_DEBUG_REGISTERS
    if (flags & CONTEXT_DEBUG_REGISTERS) ret |= SERVER_CTX_DEBUG_REGISTERS;
#endif
#ifdef CONTEXT_EXTENDED_REGISTERS
    if (flags & CONTEXT_EXTENDED_REGISTERS) ret |= SERVER_CTX_EXTENDED_REGISTERS;
#endif
    return ret;
}

/***********************************************************************
 *              NtGetContextThread  (NTDLL.@)
 *              ZwGetContextThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtGetContextThread( HANDLE handle, CONTEXT *context )
{
    NTSTATUS ret;
    DWORD dummy, i;
    DWORD needed_flags = context->ContextFlags;
    BOOL self = (handle == GetCurrentThread());

#ifdef __i386__
    /* on i386 debug registers always require a server call */
    if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386)) self = FALSE;
#endif

    if (!self)
    {
        unsigned int server_flags = get_server_context_flags( context->ContextFlags );
        context_t server_context;

        SERVER_START_REQ( get_thread_context )
        {
            req->handle  = wine_server_obj_handle( handle );
            req->flags   = server_flags;
            req->suspend = 0;
            wine_server_set_reply( req, &server_context, sizeof(server_context) );
            ret = wine_server_call( req );
            self = reply->self;
        }
        SERVER_END_REQ;

        if (ret == STATUS_PENDING)
        {
            if (NtSuspendThread( handle, &dummy ) == STATUS_SUCCESS)
            {
                for (i = 0; i < 100; i++)
                {
                    SERVER_START_REQ( get_thread_context )
                    {
                        req->handle  = wine_server_obj_handle( handle );
                        req->flags   = server_flags;
                        req->suspend = 0;
                        wine_server_set_reply( req, &server_context, sizeof(server_context) );
                        ret = wine_server_call( req );
                    }
                    SERVER_END_REQ;
                    if (ret == STATUS_PENDING)
                    {
                        LARGE_INTEGER timeout;
                        timeout.QuadPart = -10000;
                        NtDelayExecution( FALSE, &timeout );
                    }
                    else break;
                }
                NtResumeThread( handle, &dummy );
            }
            if (ret == STATUS_PENDING) ret = STATUS_ACCESS_DENIED;
        }
        if (!ret) ret = context_from_server( context, &server_context );
        if (ret) return ret;
        needed_flags &= ~context->ContextFlags;
    }

    if (self)
    {
        if (needed_flags)
        {
            CONTEXT ctx;
            RtlCaptureContext( &ctx );
            copy_context( context, &ctx, ctx.ContextFlags & needed_flags );
            context->ContextFlags |= ctx.ContextFlags & needed_flags;
        }
#ifdef __i386__
        /* update the cached version of the debug registers */
        if (context->ContextFlags & (CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386))
        {
            struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
            regs->dr0 = context->Dr0;
            regs->dr1 = context->Dr1;
            regs->dr2 = context->Dr2;
            regs->dr3 = context->Dr3;
            regs->dr6 = context->Dr6;
            regs->dr7 = context->Dr7;
        }
#endif
    }
    return STATUS_SUCCESS;
}


/******************************************************************************
 *              NtQueryInformationThread  (NTDLL.@)
 *              ZwQueryInformationThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtQueryInformationThread( HANDLE handle, THREADINFOCLASS class,
                                          void *data, ULONG length, ULONG *ret_len )
{
    NTSTATUS status;

    switch(class)
    {
    case ThreadBasicInformation:
        {
            THREAD_BASIC_INFORMATION info;
            const ULONG_PTR affinity_mask = ((ULONG_PTR)1 << NtCurrentTeb()->Peb->NumberOfProcessors) - 1;

            SERVER_START_REQ( get_thread_info )
            {
                req->handle = wine_server_obj_handle( handle );
                req->tid_in = 0;
                if (!(status = wine_server_call( req )))
                {
                    info.ExitStatus             = reply->exit_code;
                    info.TebBaseAddress         = wine_server_get_ptr( reply->teb );
                    info.ClientId.UniqueProcess = ULongToHandle(reply->pid);
                    info.ClientId.UniqueThread  = ULongToHandle(reply->tid);
                    info.AffinityMask           = reply->affinity & affinity_mask;
                    info.Priority               = reply->priority;
                    info.BasePriority           = reply->priority;  /* FIXME */
                }
            }
            SERVER_END_REQ;
            if (status == STATUS_SUCCESS)
            {
                if (data) memcpy( data, &info, min( length, sizeof(info) ));
                if (ret_len) *ret_len = min( length, sizeof(info) );
            }
        }
        return status;
    case ThreadAffinityMask:
        {
            const ULONG_PTR affinity_mask = ((ULONG_PTR)1 << NtCurrentTeb()->Peb->NumberOfProcessors) - 1;
            ULONG_PTR affinity = 0;

            SERVER_START_REQ( get_thread_info )
            {
                req->handle = wine_server_obj_handle( handle );
                req->tid_in = 0;
                if (!(status = wine_server_call( req )))
                    affinity = reply->affinity & affinity_mask;
            }
            SERVER_END_REQ;
            if (status == STATUS_SUCCESS)
            {
                if (data) memcpy( data, &affinity, min( length, sizeof(affinity) ));
                if (ret_len) *ret_len = min( length, sizeof(affinity) );
            }
        }
        return status;
    case ThreadTimes:
        {
            KERNEL_USER_TIMES   kusrt;
            /* We need to do a server call to get the creation time or exit time */
            /* This works on any thread */
            SERVER_START_REQ( get_thread_info )
            {
                req->handle = wine_server_obj_handle( handle );
                req->tid_in = 0;
                status = wine_server_call( req );
                if (status == STATUS_SUCCESS)
                {
                    kusrt.CreateTime.QuadPart = reply->creation_time;
                    kusrt.ExitTime.QuadPart = reply->exit_time;
                }
            }
            SERVER_END_REQ;
            if (status == STATUS_SUCCESS)
            {
                /* We call times(2) for kernel time or user time */
                /* We can only (portably) do this for the current thread */
                if (handle == GetCurrentThread())
                {
                    struct tms time_buf;
                    long clocks_per_sec = sysconf(_SC_CLK_TCK);

                    times(&time_buf);
                    kusrt.KernelTime.QuadPart = (ULONGLONG)time_buf.tms_stime * 10000000 / clocks_per_sec;
                    kusrt.UserTime.QuadPart = (ULONGLONG)time_buf.tms_utime * 10000000 / clocks_per_sec;
                }
                else
                {
                    static BOOL reported = FALSE;

                    kusrt.KernelTime.QuadPart = 0;
                    kusrt.UserTime.QuadPart = 0;
                    if (reported)
                        TRACE("Cannot get kerneltime or usertime of other threads\n");
                    else
                    {
                        FIXME("Cannot get kerneltime or usertime of other threads\n");
                        reported = TRUE;
                    }
                }
                if (data) memcpy( data, &kusrt, min( length, sizeof(kusrt) ));
                if (ret_len) *ret_len = min( length, sizeof(kusrt) );
            }
        }
        return status;
    case ThreadDescriptorTableEntry:
        {
#ifdef __i386__
            THREAD_DESCRIPTOR_INFORMATION*      tdi = data;
            if (length < sizeof(*tdi))
                status = STATUS_INFO_LENGTH_MISMATCH;
            else if (!(tdi->Selector & 4))  /* GDT selector */
            {
                unsigned sel = tdi->Selector & ~3;  /* ignore RPL */
                status = STATUS_SUCCESS;
                if (!sel)  /* null selector */
                    memset( &tdi->Entry, 0, sizeof(tdi->Entry) );
                else
                {
                    tdi->Entry.BaseLow                   = 0;
                    tdi->Entry.HighWord.Bits.BaseMid     = 0;
                    tdi->Entry.HighWord.Bits.BaseHi      = 0;
                    tdi->Entry.LimitLow                  = 0xffff;
                    tdi->Entry.HighWord.Bits.LimitHi     = 0xf;
                    tdi->Entry.HighWord.Bits.Dpl         = 3;
                    tdi->Entry.HighWord.Bits.Sys         = 0;
                    tdi->Entry.HighWord.Bits.Pres        = 1;
                    tdi->Entry.HighWord.Bits.Granularity = 1;
                    tdi->Entry.HighWord.Bits.Default_Big = 1;
                    tdi->Entry.HighWord.Bits.Type        = 0x12;
                    /* it has to be one of the system GDT selectors */
                    if (sel != (wine_get_ds() & ~3) && sel != (wine_get_ss() & ~3))
                    {
                        if (sel == (wine_get_cs() & ~3))
                            tdi->Entry.HighWord.Bits.Type |= 8;  /* code segment */
                        else status = STATUS_ACCESS_DENIED;
                    }
                }
            }
            else
            {
                SERVER_START_REQ( get_selector_entry )
                {
                    req->handle = wine_server_obj_handle( handle );
                    req->entry = tdi->Selector >> 3;
                    status = wine_server_call( req );
                    if (!status)
                    {
                        if (!(reply->flags & WINE_LDT_FLAGS_ALLOCATED))
                            status = STATUS_ACCESS_VIOLATION;
                        else
                        {
                            wine_ldt_set_base ( &tdi->Entry, (void *)reply->base );
                            wine_ldt_set_limit( &tdi->Entry, reply->limit );
                            wine_ldt_set_flags( &tdi->Entry, reply->flags );
                        }
                    }
                }
                SERVER_END_REQ;
            }
            if (status == STATUS_SUCCESS && ret_len)
                /* yes, that's a bit strange, but it's the way it is */
                *ret_len = sizeof(LDT_ENTRY);
#else
            status = STATUS_NOT_IMPLEMENTED;
#endif
            return status;
        }
    case ThreadAmILastThread:
        {
            SERVER_START_REQ(get_thread_info)
            {
                req->handle = wine_server_obj_handle( handle );
                req->tid_in = 0;
                status = wine_server_call( req );
                if (status == STATUS_SUCCESS)
                {
                    BOOLEAN last = reply->last;
                    if (data) memcpy( data, &last, min( length, sizeof(last) ));
                    if (ret_len) *ret_len = min( length, sizeof(last) );
                }
            }
            SERVER_END_REQ;
            return status;
        }
    case ThreadPriority:
    case ThreadBasePriority:
    case ThreadImpersonationToken:
    case ThreadEnableAlignmentFaultFixup:
    case ThreadEventPair_Reusable:
    case ThreadQuerySetWin32StartAddress:
    case ThreadZeroTlsCell:
    case ThreadPerformanceCount:
    case ThreadIdealProcessor:
    case ThreadPriorityBoost:
    case ThreadSetTlsArrayAddress:
    case ThreadIsIoPending:
    default:
        FIXME( "info class %d not supported yet\n", class );
        return STATUS_NOT_IMPLEMENTED;
    }
}


/******************************************************************************
 *              NtSetInformationThread  (NTDLL.@)
 *              ZwSetInformationThread  (NTDLL.@)
 */
NTSTATUS WINAPI NtSetInformationThread( HANDLE handle, THREADINFOCLASS class,
                                        LPCVOID data, ULONG length )
{
    NTSTATUS status;
    switch(class)
    {
    case ThreadZeroTlsCell:
        if (handle == GetCurrentThread())
        {
            LIST_ENTRY *entry;
            DWORD index;

            if (length != sizeof(DWORD)) return STATUS_INVALID_PARAMETER;
            index = *(const DWORD *)data;
            if (index < TLS_MINIMUM_AVAILABLE)
            {
                RtlAcquirePebLock();
                for (entry = tls_links.Flink; entry != &tls_links; entry = entry->Flink)
                {
                    TEB *teb = CONTAINING_RECORD(entry, TEB, TlsLinks);
                    teb->TlsSlots[index] = 0;
                }
                RtlReleasePebLock();
            }
            else
            {
                index -= TLS_MINIMUM_AVAILABLE;
                if (index >= 8 * sizeof(NtCurrentTeb()->Peb->TlsExpansionBitmapBits))
                    return STATUS_INVALID_PARAMETER;
                RtlAcquirePebLock();
                for (entry = tls_links.Flink; entry != &tls_links; entry = entry->Flink)
                {
                    TEB *teb = CONTAINING_RECORD(entry, TEB, TlsLinks);
                    if (teb->TlsExpansionSlots) teb->TlsExpansionSlots[index] = 0;
                }
                RtlReleasePebLock();
            }
            return STATUS_SUCCESS;
        }
        FIXME( "ZeroTlsCell not supported on other threads\n" );
        return STATUS_NOT_IMPLEMENTED;

    case ThreadImpersonationToken:
        {
            const HANDLE *phToken = data;
            if (length != sizeof(HANDLE)) return STATUS_INVALID_PARAMETER;
            TRACE("Setting ThreadImpersonationToken handle to %p\n", *phToken );
            SERVER_START_REQ( set_thread_info )
            {
                req->handle   = wine_server_obj_handle( handle );
                req->token    = wine_server_obj_handle( *phToken );
                req->mask     = SET_THREAD_INFO_TOKEN;
                status = wine_server_call( req );
            }
            SERVER_END_REQ;
        }
        return status;
    case ThreadBasePriority:
        {
            const DWORD *pprio = data;
            if (length != sizeof(DWORD)) return STATUS_INVALID_PARAMETER;
            SERVER_START_REQ( set_thread_info )
            {
                req->handle   = wine_server_obj_handle( handle );
                req->priority = *pprio;
                req->mask     = SET_THREAD_INFO_PRIORITY;
                status = wine_server_call( req );
            }
            SERVER_END_REQ;
        }
        return status;
    case ThreadAffinityMask:
        {
            const ULONG_PTR affinity_mask = ((ULONG_PTR)1 << NtCurrentTeb()->Peb->NumberOfProcessors) - 1;
            const ULONG_PTR *paff = data;
            if (length != sizeof(ULONG_PTR)) return STATUS_INVALID_PARAMETER;
            if (*paff & ~affinity_mask) return STATUS_INVALID_PARAMETER;
            SERVER_START_REQ( set_thread_info )
            {
                req->handle   = wine_server_obj_handle( handle );
                req->affinity = *paff;
                req->mask     = SET_THREAD_INFO_AFFINITY;
                status = wine_server_call( req );
            }
            SERVER_END_REQ;
        }
        return status;
    case ThreadBasicInformation:
    case ThreadTimes:
    case ThreadPriority:
    case ThreadDescriptorTableEntry:
    case ThreadEnableAlignmentFaultFixup:
    case ThreadEventPair_Reusable:
    case ThreadQuerySetWin32StartAddress:
    case ThreadPerformanceCount:
    case ThreadAmILastThread:
    case ThreadIdealProcessor:
    case ThreadPriorityBoost:
    case ThreadSetTlsArrayAddress:
    case ThreadIsIoPending:
    default:
        FIXME( "info class %d not supported yet\n", class );
        return STATUS_NOT_IMPLEMENTED;
    }
}

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