freerdp/winpr/libwinpr/synch/wait.c

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2023-05-09 21:29:50 +00:00
/**
* WinPR: Windows Portable Runtime
* Synchronization Functions
*
* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2014 Hardening <contact@hardening-consulting.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <assert.h>
#include <errno.h>
#include <winpr/crt.h>
#include <winpr/synch.h>
#include <winpr/platform.h>
#include <winpr/sysinfo.h>
#include "synch.h"
#include "pollset.h"
#include "../thread/thread.h"
#include <winpr/thread.h>
#include <winpr/debug.h>
#include "../log.h"
#define TAG WINPR_TAG("sync.wait")
/**
* WaitForSingleObject
* WaitForSingleObjectEx
* WaitForMultipleObjectsEx
* SignalObjectAndWait
*/
#ifndef _WIN32
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <sys/wait.h>
#include "../handle/handle.h"
#include "../pipe/pipe.h"
/* clock_gettime is not implemented on OSX prior to 10.12 */
#ifdef __MACH__
#include <mach/mach_time.h>
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME 0
#endif
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC 0
#endif
/* clock_gettime is not implemented on OSX prior to 10.12 */
int _mach_clock_gettime(int clk_id, struct timespec* t);
int _mach_clock_gettime(int clk_id, struct timespec* t)
{
UINT64 time;
double seconds;
double nseconds;
mach_timebase_info_data_t timebase;
mach_timebase_info(&timebase);
time = mach_absolute_time();
nseconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom);
seconds = ((double)time * (double)timebase.numer) / ((double)timebase.denom * 1e9);
t->tv_sec = seconds;
t->tv_nsec = nseconds;
return 0;
}
/* if clock_gettime is declared, then __CLOCK_AVAILABILITY will be defined */
#ifdef __CLOCK_AVAILABILITY
/* If we compiled with Mac OSX 10.12 or later, then clock_gettime will be declared
* * but it may be NULL at runtime. So we need to check before using it. */
int _mach_safe_clock_gettime(int clk_id, struct timespec* t);
int _mach_safe_clock_gettime(int clk_id, struct timespec* t)
{
if (clock_gettime)
{
return clock_gettime(clk_id, t);
}
return _mach_clock_gettime(clk_id, t);
}
#define clock_gettime _mach_safe_clock_gettime
#else
#define clock_gettime _mach_clock_gettime
#endif
#endif
/* Drop in replacement for pthread_mutex_timedlock
*/
#if !defined(HAVE_PTHREAD_MUTEX_TIMEDLOCK)
#include <pthread.h>
static long long ts_difftime(const struct timespec* o, const struct timespec* n)
{
long long oldValue = o->tv_sec * 1000000000LL + o->tv_nsec;
long long newValue = n->tv_sec * 1000000000LL + n->tv_nsec;
return newValue - oldValue;
}
static int pthread_mutex_timedlock(pthread_mutex_t* mutex, const struct timespec* timeout)
{
struct timespec timenow;
struct timespec sleepytime;
unsigned long long diff;
int retcode;
/* This is just to avoid a completely busy wait */
clock_gettime(CLOCK_MONOTONIC, &timenow);
diff = ts_difftime(&timenow, timeout);
sleepytime.tv_sec = diff / 1000000000LL;
sleepytime.tv_nsec = diff % 1000000000LL;
while ((retcode = pthread_mutex_trylock(mutex)) == EBUSY)
{
clock_gettime(CLOCK_MONOTONIC, &timenow);
if (ts_difftime(timeout, &timenow) >= 0)
{
return ETIMEDOUT;
}
nanosleep(&sleepytime, NULL);
}
return retcode;
}
#endif
static void ts_add_ms(struct timespec* ts, DWORD dwMilliseconds)
{
ts->tv_sec += dwMilliseconds / 1000L;
ts->tv_nsec += (dwMilliseconds % 1000L) * 1000000L;
ts->tv_sec += ts->tv_nsec / 1000000000L;
ts->tv_nsec = ts->tv_nsec % 1000000000L;
}
DWORD WaitForSingleObjectEx(HANDLE hHandle, DWORD dwMilliseconds, BOOL bAlertable)
{
ULONG Type;
WINPR_HANDLE* Object;
WINPR_POLL_SET pollset;
if (!winpr_Handle_GetInfo(hHandle, &Type, &Object))
{
WLog_ERR(TAG, "invalid hHandle.");
SetLastError(ERROR_INVALID_HANDLE);
return WAIT_FAILED;
}
if (Type == HANDLE_TYPE_PROCESS)
{
WINPR_PROCESS* process = (WINPR_PROCESS*)Object;
if (process->pid != waitpid(process->pid, &(process->status), 0))
{
WLog_ERR(TAG, "waitpid failure [%d] %s", errno, strerror(errno));
SetLastError(ERROR_INTERNAL_ERROR);
return WAIT_FAILED;
}
process->dwExitCode = (DWORD)process->status;
return WAIT_OBJECT_0;
}
if (Type == HANDLE_TYPE_MUTEX)
{
WINPR_MUTEX* mutex;
mutex = (WINPR_MUTEX*)Object;
if (dwMilliseconds != INFINITE)
{
int status;
struct timespec timeout;
clock_gettime(CLOCK_MONOTONIC, &timeout);
ts_add_ms(&timeout, dwMilliseconds);
status = pthread_mutex_timedlock(&mutex->mutex, &timeout);
if (ETIMEDOUT == status)
return WAIT_TIMEOUT;
}
else
{
pthread_mutex_lock(&mutex->mutex);
}
return WAIT_OBJECT_0;
}
else
{
int status;
WINPR_THREAD* thread;
BOOL isSet = FALSE;
size_t extraFds = 0;
DWORD ret;
BOOL autoSignaled = FALSE;
if (bAlertable)
{
thread = (WINPR_THREAD*)_GetCurrentThread();
if (!thread)
{
WLog_ERR(TAG, "failed to retrieve currentThread");
return WAIT_FAILED;
}
/* treat reentrancy, we can't switch to alertable state when we're already
treating completions */
if (thread->apc.treatingCompletions)
bAlertable = FALSE;
else
extraFds = thread->apc.length;
}
int fd = winpr_Handle_getFd(Object);
if (fd < 0)
{
WLog_ERR(TAG, "winpr_Handle_getFd did not return a fd!");
SetLastError(ERROR_INVALID_HANDLE);
return WAIT_FAILED;
}
if (!pollset_init(&pollset, 1 + extraFds))
{
WLog_ERR(TAG, "unable to initialize pollset");
SetLastError(ERROR_INTERNAL_ERROR);
return WAIT_FAILED;
}
if (!pollset_add(&pollset, fd, Object->Mode))
{
WLog_ERR(TAG, "unable to add fd in pollset");
goto out;
}
if (bAlertable && !apc_collectFds(thread, &pollset, &autoSignaled))
{
WLog_ERR(TAG, "unable to collect APC fds");
goto out;
}
if (!autoSignaled)
{
status = pollset_poll(&pollset, dwMilliseconds);
if (status < 0)
{
WLog_ERR(TAG, "waitOnFd() failure [%d] %s", errno, strerror(errno));
goto out;
}
}
ret = WAIT_TIMEOUT;
if (bAlertable && apc_executeCompletions(thread, &pollset, 1))
ret = WAIT_IO_COMPLETION;
isSet = pollset_isSignaled(&pollset, 0);
pollset_uninit(&pollset);
if (!isSet)
return ret;
return winpr_Handle_cleanup(Object);
}
out:
pollset_uninit(&pollset);
SetLastError(ERROR_INTERNAL_ERROR);
return WAIT_FAILED;
}
DWORD WaitForSingleObject(HANDLE hHandle, DWORD dwMilliseconds)
{
return WaitForSingleObjectEx(hHandle, dwMilliseconds, FALSE);
}
DWORD WaitForMultipleObjectsEx(DWORD nCount, const HANDLE* lpHandles, BOOL bWaitAll,
DWORD dwMilliseconds, BOOL bAlertable)
{
DWORD signalled;
DWORD polled;
DWORD* poll_map = NULL;
BOOL* signalled_handles = NULL;
int fd = -1;
DWORD index;
int status;
ULONG Type;
WINPR_HANDLE* Object;
WINPR_THREAD* thread;
WINPR_POLL_SET pollset;
DWORD ret = WAIT_FAILED;
size_t extraFds = 0;
UINT64 now, dueTime;
if (!nCount || (nCount > MAXIMUM_WAIT_OBJECTS))
{
WLog_ERR(TAG, "invalid handles count(%" PRIu32 ")", nCount);
return WAIT_FAILED;
}
if (bAlertable)
{
thread = winpr_GetCurrentThread();
if (!thread)
return WAIT_FAILED;
/* treat reentrancy, we can't switch to alertable state when we're already
treating completions */
if (thread->apc.treatingCompletions)
bAlertable = FALSE;
else
extraFds = thread->apc.length;
}
if (!pollset_init(&pollset, nCount + extraFds))
{
WLog_ERR(TAG, "unable to initialize pollset for nCount=%" PRIu32 " extraCount=%" PRIu32 "",
nCount, extraFds);
return WAIT_FAILED;
}
if (bWaitAll)
{
signalled_handles = alloca(nCount * sizeof(BOOL));
memset(signalled_handles, FALSE, nCount * sizeof(BOOL));
poll_map = alloca(nCount * sizeof(DWORD));
memset(poll_map, 0, nCount * sizeof(DWORD));
}
signalled = 0;
now = GetTickCount64();
if (dwMilliseconds != INFINITE)
dueTime = now + dwMilliseconds;
else
dueTime = 0xFFFFFFFFFFFFFFFF;
do
{
BOOL autoSignaled = FALSE;
polled = 0;
/* first collect file descriptors to poll */
for (index = 0; index < nCount; index++)
{
if (bWaitAll)
{
if (signalled_handles[index])
continue;
poll_map[polled] = index;
}
if (!winpr_Handle_GetInfo(lpHandles[index], &Type, &Object))
{
WLog_ERR(TAG, "invalid event file descriptor");
SetLastError(ERROR_INVALID_HANDLE);
goto out;
}
fd = winpr_Handle_getFd(Object);
if (fd == -1)
{
WLog_ERR(TAG, "invalid file descriptor");
SetLastError(ERROR_INVALID_HANDLE);
goto out;
}
if (!pollset_add(&pollset, fd, Object->Mode))
{
WLog_ERR(TAG, "unable to register fd in pollset");
SetLastError(ERROR_INVALID_HANDLE);
goto out;
}
polled++;
}
/* treat file descriptors of the APC if needed */
if (bAlertable && !apc_collectFds(thread, &pollset, &autoSignaled))
{
WLog_ERR(TAG, "unable to register APC fds");
SetLastError(ERROR_INTERNAL_ERROR);
goto out;
}
/* poll file descriptors */
status = 0;
if (!autoSignaled)
{
DWORD waitTime;
if (dwMilliseconds == INFINITE)
waitTime = INFINITE;
else
waitTime = (DWORD)(dueTime - now);
status = pollset_poll(&pollset, waitTime);
if (status < 0)
{
#ifdef HAVE_POLL_H
WLog_ERR(TAG, "poll() handle %d (%" PRIu32 ") failure [%d] %s", index, nCount,
errno, strerror(errno));
#else
WLog_ERR(TAG, "select() handle %d (%" PRIu32 ") failure [%d] %s", index, nCount,
errno, strerror(errno));
#endif
winpr_log_backtrace(TAG, WLOG_ERROR, 20);
SetLastError(ERROR_INTERNAL_ERROR);
goto out;
}
}
/* give priority to the APC queue, to return WAIT_IO_COMPLETION */
if (bAlertable && apc_executeCompletions(thread, &pollset, polled))
{
ret = WAIT_IO_COMPLETION;
goto out;
}
/* then treat pollset */
if (status)
{
for (index = 0; index < polled; index++)
{
DWORD handlesIndex;
BOOL signal_set = FALSE;
if (bWaitAll)
handlesIndex = poll_map[index];
else
handlesIndex = index;
signal_set = pollset_isSignaled(&pollset, index);
if (signal_set)
{
DWORD rc = winpr_Handle_cleanup(lpHandles[handlesIndex]);
if (rc != WAIT_OBJECT_0)
{
WLog_ERR(TAG, "error in cleanup function for handle at index=%d",
handlesIndex);
ret = rc;
goto out;
}
if (bWaitAll)
{
signalled_handles[handlesIndex] = TRUE;
/* Continue checks from last position. */
for (; signalled < nCount; signalled++)
{
if (!signalled_handles[signalled])
break;
}
}
else
{
ret = (WAIT_OBJECT_0 + handlesIndex);
goto out;
}
if (signalled >= nCount)
{
ret = WAIT_OBJECT_0;
goto out;
}
}
}
}
if (bAlertable && thread->apc.length > extraFds)
{
pollset_uninit(&pollset);
extraFds = thread->apc.length;
if (!pollset_init(&pollset, nCount + extraFds))
{
WLog_ERR(TAG, "unable reallocate pollset");
SetLastError(ERROR_INTERNAL_ERROR);
return WAIT_FAILED;
}
}
else
pollset_reset(&pollset);
now = GetTickCount64();
} while (now < dueTime);
ret = WAIT_TIMEOUT;
out:
pollset_uninit(&pollset);
return ret;
}
DWORD WaitForMultipleObjects(DWORD nCount, const HANDLE* lpHandles, BOOL bWaitAll,
DWORD dwMilliseconds)
{
return WaitForMultipleObjectsEx(nCount, lpHandles, bWaitAll, dwMilliseconds, FALSE);
}
DWORD SignalObjectAndWait(HANDLE hObjectToSignal, HANDLE hObjectToWaitOn, DWORD dwMilliseconds,
BOOL bAlertable)
{
if (!SetEvent(hObjectToSignal))
return WAIT_FAILED;
return WaitForSingleObjectEx(hObjectToWaitOn, dwMilliseconds, bAlertable);
}
#endif