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Sweden-Number/scheduler/synchro.c

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/*
* Win32 process and thread synchronisation
*
* Copyright 1997 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., 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
#include <sys/poll.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <string.h>
#include "file.h" /* for DOSFS_UnixTimeToFileTime */
#include "thread.h"
#include "winerror.h"
#include "wine/server.h"
#include "async.h"
/***********************************************************************
* get_timeout
*/
inline static void get_timeout( struct timeval *when, int timeout )
{
gettimeofday( when, 0 );
if (timeout)
{
long sec = timeout / 1000;
if ((when->tv_usec += (timeout - 1000*sec) * 1000) >= 1000000)
{
when->tv_usec -= 1000000;
when->tv_sec++;
}
when->tv_sec += sec;
}
}
/***********************************************************************
* check_async_list
*
* Process a status event from the server.
*/
static void WINAPI check_async_list(async_private *asp, DWORD status)
{
async_private *ovp;
DWORD ovp_status;
for( ovp = NtCurrentTeb()->pending_list; ovp && ovp != asp; ovp = ovp->next );
if(!ovp)
return;
if( status != STATUS_ALERTED )
{
ovp_status = status;
ovp->ops->set_status (ovp, status);
}
else ovp_status = ovp->ops->get_status (ovp);
if( ovp_status == STATUS_PENDING ) ovp->func( ovp );
/* This will destroy all but PENDING requests */
register_old_async( ovp );
}
/***********************************************************************
* 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( NtCurrentTeb()->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( NtCurrentTeb()->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... */
SYSDEPS_AbortThread(0);
}
/***********************************************************************
* call_apcs
*
* Call outstanding APCs.
*/
static void call_apcs( BOOL alertable )
{
FARPROC proc = NULL;
FILETIME ft;
void *args[4];
for (;;)
{
int type = APC_NONE;
SERVER_START_REQ( get_apc )
{
req->alertable = alertable;
wine_server_set_reply( req, args, sizeof(args) );
if (!wine_server_call( req ))
{
type = reply->type;
proc = reply->func;
}
}
SERVER_END_REQ;
switch(type)
{
case APC_NONE:
return; /* no more APCs */
case APC_ASYNC:
proc( args[0], args[1]);
break;
case APC_USER:
proc( args[0] );
break;
case APC_TIMER:
/* convert sec/usec to NT time */
DOSFS_UnixTimeToFileTime( (time_t)args[0], &ft, (DWORD)args[1] * 10 );
proc( args[2], ft.dwLowDateTime, ft.dwHighDateTime );
break;
case APC_ASYNC_IO:
check_async_list ( args[0], (DWORD) args[1]);
break;
default:
server_protocol_error( "get_apc_request: bad type %d\n", type );
break;
}
}
}
/***********************************************************************
* Sleep (KERNEL32.@)
*/
VOID WINAPI Sleep( DWORD timeout )
{
WaitForMultipleObjectsEx( 0, NULL, FALSE, timeout, FALSE );
}
/******************************************************************************
* SleepEx (KERNEL32.@)
*/
DWORD WINAPI SleepEx( DWORD timeout, BOOL alertable )
{
DWORD ret = WaitForMultipleObjectsEx( 0, NULL, FALSE, timeout, alertable );
if (ret != WAIT_IO_COMPLETION) ret = 0;
return ret;
}
/***********************************************************************
* WaitForSingleObject (KERNEL32.@)
*/
DWORD WINAPI WaitForSingleObject( HANDLE handle, DWORD timeout )
{
return WaitForMultipleObjectsEx( 1, &handle, FALSE, timeout, FALSE );
}
/***********************************************************************
* WaitForSingleObjectEx (KERNEL32.@)
*/
DWORD WINAPI WaitForSingleObjectEx( HANDLE handle, DWORD timeout,
BOOL alertable )
{
return WaitForMultipleObjectsEx( 1, &handle, FALSE, timeout, alertable );
}
/***********************************************************************
* WaitForMultipleObjects (KERNEL32.@)
*/
DWORD WINAPI WaitForMultipleObjects( DWORD count, const HANDLE *handles,
BOOL wait_all, DWORD timeout )
{
return WaitForMultipleObjectsEx( count, handles, wait_all, timeout, FALSE );
}
/***********************************************************************
* WaitForMultipleObjectsEx (KERNEL32.@)
*/
DWORD WINAPI WaitForMultipleObjectsEx( DWORD count, const HANDLE *handles,
BOOL wait_all, DWORD timeout,
BOOL alertable )
{
int ret, cookie;
struct timeval tv;
if (count > MAXIMUM_WAIT_OBJECTS)
{
SetLastError( ERROR_INVALID_PARAMETER );
return WAIT_FAILED;
}
if (timeout == INFINITE) tv.tv_sec = tv.tv_usec = 0;
else get_timeout( &tv, timeout );
for (;;)
{
SERVER_START_REQ( select )
{
req->flags = SELECT_INTERRUPTIBLE;
req->cookie = &cookie;
req->sec = tv.tv_sec;
req->usec = tv.tv_usec;
wine_server_add_data( req, handles, count * sizeof(HANDLE) );
if (wait_all) req->flags |= SELECT_ALL;
if (alertable) req->flags |= SELECT_ALERTABLE;
if (timeout != INFINITE) req->flags |= SELECT_TIMEOUT;
ret = wine_server_call( req );
}
SERVER_END_REQ;
if (ret == STATUS_PENDING) ret = wait_reply( &cookie );
if (ret != STATUS_USER_APC) break;
call_apcs( alertable );
if (alertable) break;
}
if (HIWORD(ret)) /* is it an error code? */
{
SetLastError( RtlNtStatusToDosError(ret) );
ret = WAIT_FAILED;
}
return ret;
}
/***********************************************************************
* WaitForSingleObject (KERNEL.460)
*/
DWORD WINAPI WaitForSingleObject16( HANDLE handle, DWORD timeout )
{
DWORD retval, mutex_count;
ReleaseThunkLock( &mutex_count );
retval = WaitForSingleObject( handle, timeout );
RestoreThunkLock( mutex_count );
return retval;
}
/***********************************************************************
* WaitForMultipleObjects (KERNEL.461)
*/
DWORD WINAPI WaitForMultipleObjects16( DWORD count, const HANDLE *handles,
BOOL wait_all, DWORD timeout )
{
DWORD retval, mutex_count;
ReleaseThunkLock( &mutex_count );
retval = WaitForMultipleObjectsEx( count, handles, wait_all, timeout, FALSE );
RestoreThunkLock( mutex_count );
return retval;
}
/***********************************************************************
* WaitForMultipleObjectsEx (KERNEL.495)
*/
DWORD WINAPI WaitForMultipleObjectsEx16( DWORD count, const HANDLE *handles,
BOOL wait_all, DWORD timeout, BOOL alertable )
{
DWORD retval, mutex_count;
ReleaseThunkLock( &mutex_count );
retval = WaitForMultipleObjectsEx( count, handles, wait_all, timeout, alertable );
RestoreThunkLock( mutex_count );
return retval;
}
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