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Sweden-Number/scheduler/synchro.c

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/*
* Win32 process and thread synchronisation
*
* Copyright 1997 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <unistd.h>
#include <string.h>
#include "file.h" /* for DOSFS_UnixTimeToFileTime */
#include "thread.h"
#include "winerror.h"
#include "server.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;
}
}
#define MAX_NUMBER_OF_FDS 20
static inline int time_before( struct timeval *t1, struct timeval *t2 )
{
return ((t1->tv_sec < t2->tv_sec) ||
((t1->tv_sec == t2->tv_sec) && (t1->tv_usec < t2->tv_usec)));
}
static void finish_async(async_private *ovp)
{
/* remove it from the active list */
if(ovp->prev)
ovp->prev->next = ovp->next;
else
NtCurrentTeb()->pending_list = ovp->next;
if(ovp->next)
ovp->next->prev = ovp->prev;
ovp->next=NULL;
ovp->prev=NULL;
close(ovp->fd);
NtSetEvent(ovp->lpOverlapped->hEvent,NULL);
HeapFree(GetProcessHeap(), 0, ovp);
}
/***********************************************************************
* check_async_list
*
* Create a list of fds for poll to check while waiting on the server
* FIXME: this loop is too large, cut into smaller functions
* perhaps we could share/steal some of the code in server/select.c?
*/
static void check_async_list(void)
{
/* FIXME: should really malloc these two arrays */
struct pollfd fds[MAX_NUMBER_OF_FDS];
async_private *user[MAX_NUMBER_OF_FDS], *tmp;
int i, n, r, timeout;
async_private *ovp, *timeout_user;
struct timeval now;
while(1)
{
/* the first fd belongs to the server connection */
fds[0].events=POLLIN;
fds[0].revents=0;
fds[0].fd = NtCurrentTeb()->wait_fd[0];
ovp = NtCurrentTeb()->pending_list;
timeout = -1;
timeout_user = NULL;
gettimeofday(&now,NULL);
for(n=1; ovp && (n<MAX_NUMBER_OF_FDS); ovp = tmp)
{
tmp = ovp->next;
if(ovp->lpOverlapped->Internal!=STATUS_PENDING)
{
ovp->lpOverlapped->Internal=STATUS_UNSUCCESSFUL;
finish_async(ovp);
continue;
}
if(ovp->timeout && time_before(&ovp->tv,&now))
{
ovp->lpOverlapped->Internal=STATUS_TIMEOUT;
finish_async(ovp);
continue;
}
fds[n].fd=ovp->fd;
fds[n].events=ovp->event;
fds[n].revents=0;
user[n] = ovp;
if(ovp->timeout && ( (!timeout_user) || time_before(&ovp->tv,&timeout_user->tv)))
{
timeout = (ovp->tv.tv_sec - now.tv_sec) * 1000
+ (ovp->tv.tv_usec - now.tv_usec) / 1000;
timeout_user = ovp;
}
n++;
}
/* if there aren't any active asyncs return */
if(n==1)
return;
r = poll(fds, n, timeout);
/* if there were any errors, return immediately */
if( (r<0) || (fds[0].revents==POLLNVAL) )
return;
if( r==0 )
{
timeout_user->lpOverlapped->Internal = STATUS_TIMEOUT;
finish_async(timeout_user);
continue;
}
/* search for async operations that are ready */
for( i=1; i<n; i++)
{
if (fds[i].revents)
user[i]->func(user[i],fds[i].revents);
if(user[i]->lpOverlapped->Internal!=STATUS_PENDING)
finish_async(user[i]);
}
if(fds[0].revents == POLLIN)
return;
}
}
/***********************************************************************
* 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;
if (NtCurrentTeb()->pending_list) check_async_list();
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_ExitThread(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_VAR_REQ( get_apc, sizeof(args) )
{
req->alertable = alertable;
if (!SERVER_CALL())
{
type = req->type;
proc = req->func;
memcpy( args, server_data_ptr(req), server_data_size(req) );
}
}
SERVER_END_VAR_REQ;
switch(type)
{
case APC_NONE:
return; /* no more APCs */
case APC_ASYNC:
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;
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 i, 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_VAR_REQ( select, count * sizeof(int) )
{
int *data = server_data_ptr( req );
req->flags = SELECT_INTERRUPTIBLE;
req->cookie = &cookie;
req->sec = tv.tv_sec;
req->usec = tv.tv_usec;
for (i = 0; i < count; i++) data[i] = handles[i];
if (wait_all) req->flags |= SELECT_ALL;
if (alertable) req->flags |= SELECT_ALERTABLE;
if (timeout != INFINITE) req->flags |= SELECT_TIMEOUT;
ret = SERVER_CALL();
}
SERVER_END_VAR_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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