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/*
* Process synchronisation
*
* Copyright 1996, 1997, 1998 Marcus Meissner
* Copyright 1997, 1999 Alexandre Julliard
* Copyright 1999, 2000 Juergen Schmied
* Copyright 2003 Eric Pouech
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <signal.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SCHED_H
# include <sched.h>
#endif
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "thread.h"
#include "wine/server.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
/*
* Semaphores
*/
/******************************************************************************
* NtCreateSemaphore (NTDLL.@)
*/
NTSTATUS WINAPI NtCreateSemaphore( OUT PHANDLE SemaphoreHandle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES *attr OPTIONAL,
IN LONG InitialCount,
IN LONG MaximumCount )
{
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
NTSTATUS ret;
if (MaximumCount <= 0 || InitialCount < 0 || InitialCount > MaximumCount)
return STATUS_INVALID_PARAMETER;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( create_semaphore )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
req->initial = InitialCount;
req->max = MaximumCount;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
ret = wine_server_call( req );
*SemaphoreHandle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtOpenSemaphore (NTDLL.@)
*/
NTSTATUS WINAPI NtOpenSemaphore( OUT PHANDLE SemaphoreHandle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES *attr )
{
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
NTSTATUS ret;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( open_semaphore )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
ret = wine_server_call( req );
*SemaphoreHandle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtQuerySemaphore (NTDLL.@)
*/
NTSTATUS WINAPI NtQuerySemaphore(
HANDLE SemaphoreHandle,
SEMAPHORE_INFORMATION_CLASS SemaphoreInformationClass,
PVOID SemaphoreInformation,
ULONG Length,
PULONG ReturnLength)
{
FIXME("(%p,%d,%p,0x%08lx,%p) stub!\n",
SemaphoreHandle, SemaphoreInformationClass, SemaphoreInformation, Length, ReturnLength);
return STATUS_SUCCESS;
}
/******************************************************************************
* NtReleaseSemaphore (NTDLL.@)
*/
NTSTATUS WINAPI NtReleaseSemaphore( HANDLE handle, ULONG count, PULONG previous )
{
NTSTATUS ret;
SERVER_START_REQ( release_semaphore )
{
req->handle = handle;
req->count = count;
if (!(ret = wine_server_call( req )))
{
if (previous) *previous = reply->prev_count;
}
}
SERVER_END_REQ;
return ret;
}
/*
* Events
*/
/**************************************************************************
* NtCreateEvent (NTDLL.@)
* ZwCreateEvent (NTDLL.@)
*/
NTSTATUS WINAPI NtCreateEvent(
OUT PHANDLE EventHandle,
IN ACCESS_MASK DesiredAccess,
IN const OBJECT_ATTRIBUTES *attr,
IN BOOLEAN ManualReset,
IN BOOLEAN InitialState)
{
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
NTSTATUS ret;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( create_event )
{
req->access = DesiredAccess;
req->attributes = (attr) ? attr->Attributes : 0;
req->manual_reset = ManualReset;
req->initial_state = InitialState;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
ret = wine_server_call( req );
*EventHandle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtOpenEvent (NTDLL.@)
* ZwOpenEvent (NTDLL.@)
*/
NTSTATUS WINAPI NtOpenEvent(
OUT PHANDLE EventHandle,
IN ACCESS_MASK DesiredAccess,
IN const OBJECT_ATTRIBUTES *attr )
{
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
NTSTATUS ret;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( open_event )
{
req->access = DesiredAccess;
req->attributes = (attr) ? attr->Attributes : 0;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
ret = wine_server_call( req );
*EventHandle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtSetEvent (NTDLL.@)
* ZwSetEvent (NTDLL.@)
*/
NTSTATUS WINAPI NtSetEvent( HANDLE handle, PULONG NumberOfThreadsReleased )
{
NTSTATUS ret;
/* FIXME: set NumberOfThreadsReleased */
SERVER_START_REQ( event_op )
{
req->handle = handle;
req->op = SET_EVENT;
ret = wine_server_call( req );
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtResetEvent (NTDLL.@)
*/
NTSTATUS WINAPI NtResetEvent( HANDLE handle, PULONG NumberOfThreadsReleased )
{
NTSTATUS ret;
/* resetting an event can't release any thread... */
if (NumberOfThreadsReleased) *NumberOfThreadsReleased = 0;
SERVER_START_REQ( event_op )
{
req->handle = handle;
req->op = RESET_EVENT;
ret = wine_server_call( req );
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtClearEvent (NTDLL.@)
*
* FIXME
* same as NtResetEvent ???
*/
NTSTATUS WINAPI NtClearEvent ( HANDLE handle )
{
return NtResetEvent( handle, NULL );
}
/******************************************************************************
* NtPulseEvent (NTDLL.@)
*
* FIXME
* PulseCount
*/
NTSTATUS WINAPI NtPulseEvent( HANDLE handle, PULONG PulseCount )
{
NTSTATUS ret;
if (PulseCount)
FIXME("(%p,%ld)\n", handle, *PulseCount);
SERVER_START_REQ( event_op )
{
req->handle = handle;
req->op = PULSE_EVENT;
ret = wine_server_call( req );
}
SERVER_END_REQ;
return ret;
}
/******************************************************************************
* NtQueryEvent (NTDLL.@)
*/
NTSTATUS WINAPI NtQueryEvent (
IN HANDLE EventHandle,
IN UINT EventInformationClass,
OUT PVOID EventInformation,
IN ULONG EventInformationLength,
OUT PULONG ReturnLength)
{
FIXME("(%p)\n", EventHandle);
return STATUS_SUCCESS;
}
/*
* Mutants (known as Mutexes in Kernel32)
*/
/******************************************************************************
* NtCreateMutant [NTDLL.@]
* ZwCreateMutant [NTDLL.@]
*/
NTSTATUS WINAPI NtCreateMutant(OUT HANDLE* MutantHandle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES* attr OPTIONAL,
IN BOOLEAN InitialOwner)
{
NTSTATUS status;
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( create_mutex )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
req->owned = InitialOwner;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
status = wine_server_call( req );
*MutantHandle = reply->handle;
}
SERVER_END_REQ;
return status;
}
/**************************************************************************
* NtOpenMutant [NTDLL.@]
* ZwOpenMutant [NTDLL.@]
*/
NTSTATUS WINAPI NtOpenMutant(OUT HANDLE* MutantHandle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES* attr )
{
NTSTATUS status;
DWORD len = attr && attr->ObjectName ? attr->ObjectName->Length : 0;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( open_mutex )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
status = wine_server_call( req );
*MutantHandle = reply->handle;
}
SERVER_END_REQ;
return status;
}
/**************************************************************************
* NtReleaseMutant [NTDLL.@]
* ZwReleaseMutant [NTDLL.@]
*/
NTSTATUS WINAPI NtReleaseMutant( IN HANDLE handle, OUT PLONG prev_count OPTIONAL)
{
NTSTATUS status;
SERVER_START_REQ( release_mutex )
{
req->handle = handle;
status = wine_server_call( req );
if (prev_count) *prev_count = reply->prev_count;
}
SERVER_END_REQ;
return status;
}
/******************************************************************
* NtQueryMutant [NTDLL.@]
* ZwQueryMutant [NTDLL.@]
*/
NTSTATUS WINAPI NtQueryMutant(IN HANDLE handle,
IN MUTANT_INFORMATION_CLASS MutantInformationClass,
OUT PVOID MutantInformation,
IN ULONG MutantInformationLength,
OUT PULONG ResultLength OPTIONAL )
{
FIXME("(%p %u %p %lu %p): stub!\n",
handle, MutantInformationClass, MutantInformation, MutantInformationLength, ResultLength);
return STATUS_NOT_IMPLEMENTED;
}
/*
* Timers
*/
/**************************************************************************
* NtCreateTimer [NTDLL.@]
* ZwCreateTimer [NTDLL.@]
*/
NTSTATUS WINAPI NtCreateTimer(OUT HANDLE *handle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES *attr OPTIONAL,
IN TIMER_TYPE timer_type)
{
DWORD len = (attr && attr->ObjectName) ? attr->ObjectName->Length : 0;
NTSTATUS status;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
if (timer_type != NotificationTimer && timer_type != SynchronizationTimer)
return STATUS_INVALID_PARAMETER;
SERVER_START_REQ( create_timer )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
req->manual = (timer_type == NotificationTimer) ? TRUE : FALSE;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
status = wine_server_call( req );
*handle = reply->handle;
}
SERVER_END_REQ;
return status;
}
/**************************************************************************
* NtOpenTimer [NTDLL.@]
* ZwOpenTimer [NTDLL.@]
*/
NTSTATUS WINAPI NtOpenTimer(OUT PHANDLE handle,
IN ACCESS_MASK access,
IN const OBJECT_ATTRIBUTES* attr )
{
DWORD len = (attr && attr->ObjectName) ? attr->ObjectName->Length : 0;
NTSTATUS status;
if (len >= MAX_PATH * sizeof(WCHAR)) return STATUS_NAME_TOO_LONG;
SERVER_START_REQ( open_timer )
{
req->access = access;
req->attributes = (attr) ? attr->Attributes : 0;
if (len) wine_server_add_data( req, attr->ObjectName->Buffer, len );
status = wine_server_call( req );
*handle = reply->handle;
}
SERVER_END_REQ;
return status;
}
/**************************************************************************
* NtSetTimer [NTDLL.@]
* ZwSetTimer [NTDLL.@]
*/
NTSTATUS WINAPI NtSetTimer(IN HANDLE handle,
IN const LARGE_INTEGER* when,
IN PTIMER_APC_ROUTINE callback,
IN PVOID callback_arg,
IN BOOLEAN resume,
IN ULONG period OPTIONAL,
OUT PBOOLEAN state OPTIONAL)
{
NTSTATUS status = STATUS_SUCCESS;
TRACE("(%p,%p,%p,%p,%08x,0x%08lx,%p) stub\n",
handle, when, callback, callback_arg, resume, period, state);
SERVER_START_REQ( set_timer )
{
if (!when->u.LowPart && !when->u.HighPart)
{
/* special case to start timeout on now+period without too many calculations */
req->expire.sec = 0;
req->expire.usec = 0;
}
else NTDLL_get_server_timeout( &req->expire, when );
req->handle = handle;
req->period = period;
req->callback = callback;
req->arg = callback_arg;
status = wine_server_call( req );
if (state) *state = reply->signaled;
}
SERVER_END_REQ;
/* set error but can still succeed */
if (resume && status == STATUS_SUCCESS) return STATUS_TIMER_RESUME_IGNORED;
return status;
}
/**************************************************************************
* NtCancelTimer [NTDLL.@]
* ZwCancelTimer [NTDLL.@]
*/
NTSTATUS WINAPI NtCancelTimer(IN HANDLE handle, OUT BOOLEAN* state)
{
NTSTATUS status;
SERVER_START_REQ( cancel_timer )
{
req->handle = handle;
status = wine_server_call( req );
if (state) *state = reply->signaled;
}
SERVER_END_REQ;
return status;
}
/******************************************************************************
* NtQueryTimer (NTDLL.@)
*
* Retrieves information about a timer.
*
* PARAMS
* TimerHandle [I] The timer to retrieve information about.
* TimerInformationClass [I] The type of information to retrieve.
* TimerInformation [O] Pointer to buffer to store information in.
* Length [I] The length of the buffer pointed to by TimerInformation.
* ReturnLength [O] Optional. The size of buffer actually used.
*
* RETURNS
* Success: STATUS_SUCCESS
* Failure: STATUS_INFO_LENGTH_MISMATCH, if Length doesn't match the required data
* size for the class specified.
* STATUS_INVALID_INFO_CLASS, if an invalid TimerInformationClass was specified.
* STATUS_ACCESS_DENIED, if TimerHandle does not have TIMER_QUERY_STATE access
* to the timer.
*/
NTSTATUS WINAPI NtQueryTimer(
HANDLE TimerHandle,
TIMER_INFORMATION_CLASS TimerInformationClass,
PVOID TimerInformation,
ULONG Length,
PULONG ReturnLength)
{
TIMER_BASIC_INFORMATION * basic_info = (TIMER_BASIC_INFORMATION *)TimerInformation;
NTSTATUS status;
LARGE_INTEGER now;
TRACE("(%p,%d,%p,0x%08lx,%p)\n", TimerHandle, TimerInformationClass,
TimerInformation, Length, ReturnLength);
switch (TimerInformationClass)
{
case TimerBasicInformation:
if (Length < sizeof(TIMER_BASIC_INFORMATION))
return STATUS_INFO_LENGTH_MISMATCH;
SERVER_START_REQ(get_timer_info)
{
req->handle = TimerHandle;
status = wine_server_call(req);
/* convert server time to absolute NTDLL time */
NTDLL_from_server_timeout(&basic_info->RemainingTime, &reply->when);
basic_info->TimerState = reply->signaled;
}
SERVER_END_REQ;
/* convert from absolute into relative time */
NtQuerySystemTime(&now);
if (now.QuadPart > basic_info->RemainingTime.QuadPart)
basic_info->RemainingTime.QuadPart = 0;
else
basic_info->RemainingTime.QuadPart -= now.QuadPart;
if (ReturnLength) *ReturnLength = sizeof(TIMER_BASIC_INFORMATION);
return status;
}
FIXME("Unhandled class %d\n", TimerInformationClass);
return STATUS_INVALID_INFO_CLASS;
}
/******************************************************************************
* NtQueryTimerResolution [NTDLL.@]
*/
NTSTATUS WINAPI NtQueryTimerResolution(OUT ULONG* min_resolution,
OUT ULONG* max_resolution,
OUT ULONG* current_resolution)
{
FIXME("(%p,%p,%p), stub!\n",
min_resolution, max_resolution, current_resolution);
return STATUS_NOT_IMPLEMENTED;
}
/******************************************************************************
* NtSetTimerResolution [NTDLL.@]
*/
NTSTATUS WINAPI NtSetTimerResolution(IN ULONG resolution,
IN BOOLEAN set_resolution,
OUT ULONG* current_resolution )
{
FIXME("(%lu,%u,%p), stub!\n",
resolution, set_resolution, current_resolution);
return STATUS_NOT_IMPLEMENTED;
}
/***********************************************************************
* wait_reply
*
* Wait for a reply on the waiting pipe of the current thread.
*/
static int wait_reply( void *cookie )
{
int signaled;
struct wake_up_reply reply;
for (;;)
{
int ret;
ret = read( ntdll_get_thread_data()->wait_fd[0], &reply, sizeof(reply) );
if (ret == sizeof(reply))
{
if (!reply.cookie) break; /* thread got killed */
if (reply.cookie == cookie) return reply.signaled;
/* we stole another reply, wait for the real one */
signaled = wait_reply( cookie );
/* and now put the wrong one back in the pipe */
for (;;)
{
ret = write( ntdll_get_thread_data()->wait_fd[1], &reply, sizeof(reply) );
if (ret == sizeof(reply)) break;
if (ret >= 0) server_protocol_error( "partial wakeup write %d\n", ret );
if (errno == EINTR) continue;
server_protocol_perror("wakeup write");
}
return signaled;
}
if (ret >= 0) server_protocol_error( "partial wakeup read %d\n", ret );
if (errno == EINTR) continue;
server_protocol_perror("wakeup read");
}
/* the server closed the connection; time to die... */
server_abort_thread(0);
}
/***********************************************************************
* call_apcs
*
* Call outstanding APCs.
*/
static void call_apcs( BOOL alertable )
{
FARPROC proc;
LARGE_INTEGER time;
void *arg1, *arg2, *arg3;
for (;;)
{
int type = APC_NONE;
SERVER_START_REQ( get_apc )
{
req->alertable = alertable;
if (!wine_server_call( req )) type = reply->type;
proc = reply->func;
arg1 = reply->arg1;
arg2 = reply->arg2;
arg3 = reply->arg3;
}
SERVER_END_REQ;
switch (type)
{
case APC_NONE:
return; /* no more APCs */
case APC_USER:
proc( arg1, arg2, arg3 );
break;
case APC_TIMER:
/* convert sec/usec to NT time */
RtlSecondsSince1970ToTime( (time_t)arg1, &time );
time.QuadPart += (DWORD)arg2 * 10;
proc( arg3, time.u.LowPart, time.u.HighPart );
break;
case APC_ASYNC_IO:
NtCurrentTeb()->num_async_io--;
proc( arg1, (IO_STATUS_BLOCK*)arg2, (ULONG)arg3 );
break;
default:
server_protocol_error( "get_apc_request: bad type %d\n", type );
break;
}
}
}
/***********************************************************************
* NTDLL_wait_for_multiple_objects
*
* Implementation of NtWaitForMultipleObjects
*/
NTSTATUS NTDLL_wait_for_multiple_objects( UINT count, const HANDLE *handles, UINT flags,
const LARGE_INTEGER *timeout, HANDLE signal_object )
{
NTSTATUS ret;
int cookie;
if (timeout) flags |= SELECT_TIMEOUT;
for (;;)
{
SERVER_START_REQ( select )
{
req->flags = flags;
req->cookie = &cookie;
req->signal = signal_object;
NTDLL_get_server_timeout( &req->timeout, timeout );
wine_server_add_data( req, handles, count * sizeof(HANDLE) );
ret = wine_server_call( req );
}
SERVER_END_REQ;
if (ret == STATUS_PENDING) ret = wait_reply( &cookie );
if (ret != STATUS_USER_APC) break;
call_apcs( (flags & SELECT_ALERTABLE) != 0 );
if (flags & SELECT_ALERTABLE) break;
signal_object = 0; /* don't signal it multiple times */
}
/* A test on Windows 2000 shows that Windows always yields during
a wait, but a wait that is hit by an event gets a priority
boost as well. This seems to model that behavior the closest. */
if (ret == WAIT_TIMEOUT) NtYieldExecution();
return ret;
}
/* wait operations */
/******************************************************************
* NtWaitForMultipleObjects (NTDLL.@)
*/
NTSTATUS WINAPI NtWaitForMultipleObjects( DWORD count, const HANDLE *handles,
BOOLEAN wait_all, BOOLEAN alertable,
const LARGE_INTEGER *timeout )
{
UINT flags = SELECT_INTERRUPTIBLE;
if (!count || count > MAXIMUM_WAIT_OBJECTS) return STATUS_INVALID_PARAMETER_1;
if (wait_all) flags |= SELECT_ALL;
if (alertable) flags |= SELECT_ALERTABLE;
return NTDLL_wait_for_multiple_objects( count, handles, flags, timeout, 0 );
}
/******************************************************************
* NtWaitForSingleObject (NTDLL.@)
*/
NTSTATUS WINAPI NtWaitForSingleObject(HANDLE handle, BOOLEAN alertable, const LARGE_INTEGER *timeout )
{
return NtWaitForMultipleObjects( 1, &handle, FALSE, alertable, timeout );
}
/******************************************************************
* NtSignalAndWaitForSingleObject (NTDLL.@)
*/
NTSTATUS WINAPI NtSignalAndWaitForSingleObject( HANDLE hSignalObject, HANDLE hWaitObject,
BOOLEAN alertable, const LARGE_INTEGER *timeout )
{
UINT flags = SELECT_INTERRUPTIBLE;
if (!hSignalObject) return STATUS_INVALID_HANDLE;
if (alertable) flags |= SELECT_ALERTABLE;
return NTDLL_wait_for_multiple_objects( 1, &hWaitObject, flags, timeout, hSignalObject );
}
/******************************************************************
* NtYieldExecution (NTDLL.@)
*/
NTSTATUS WINAPI NtYieldExecution(void)
{
#ifdef HAVE_SCHED_YIELD
sched_yield();
return STATUS_SUCCESS;
#else
return STATUS_NO_YIELD_PERFORMED;
#endif
}
/******************************************************************
* NtDelayExecution (NTDLL.@)
*/
NTSTATUS WINAPI NtDelayExecution( BOOLEAN alertable, const LARGE_INTEGER *timeout )
{
/* if alertable or async I/O in progress, we need to query the server */
if (alertable || NtCurrentTeb()->num_async_io)
{
UINT flags = SELECT_INTERRUPTIBLE;
if (alertable) flags |= SELECT_ALERTABLE;
return NTDLL_wait_for_multiple_objects( 0, NULL, flags, timeout, 0 );
}
if (!timeout) /* sleep forever */
{
for (;;) select( 0, NULL, NULL, NULL, NULL );
}
else
{
abs_time_t when;
NTDLL_get_server_timeout( &when, timeout );
/* Note that we yield after establishing the desired timeout */
NtYieldExecution();
for (;;)
{
struct timeval tv;
gettimeofday( &tv, 0 );
tv.tv_sec = when.sec - tv.tv_sec;
if ((tv.tv_usec = when.usec - tv.tv_usec) < 0)
{
tv.tv_usec += 1000000;
tv.tv_sec--;
}
/* if our yield already passed enough time, we're done */
if (tv.tv_sec < 0) break;
if (select( 0, NULL, NULL, NULL, &tv ) != -1) break;
}
}
return STATUS_SUCCESS;
}
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