/**
* WaitForMultipleObjectsEx:
* @numobjects: The number of objects in @handles. The maximum allowed
* is %MAXIMUM_WAIT_OBJECTS.
* @handles: An array of object handles. Duplicates are not allowed.
* @waitall: If %TRUE, this function waits until all of the handles
* are signalled. If %FALSE, this function returns when any object is
* signalled.
* @timeout: The maximum time in milliseconds to wait for.
* @alertable: if TRUE, the wait can be interrupted by an APC call
*
* This function returns when either one or more of @handles is
* signalled, or @timeout ms elapses. If @timeout is zero, the state
* of each item of @handles is tested and the function returns
* immediately. If @timeout is %INFINITE, the function waits forever.
*
* Return value: %WAIT_OBJECT_0 to %WAIT_OBJECT_0 + @numobjects - 1 -
* if @waitall is %TRUE, indicates that all objects are signalled. If
* @waitall is %FALSE, the return value minus %WAIT_OBJECT_0 indicates
* the first index into @handles of the objects that are signalled.
* %WAIT_ABANDONED_0 to %WAIT_ABANDONED_0 + @numobjects - 1 - if
* @waitall is %TRUE, indicates that all objects are signalled, and at
* least one object is an abandoned mutex object (See
* WaitForSingleObject() for a description of abandoned mutexes.) If
* @waitall is %FALSE, the return value minus %WAIT_ABANDONED_0
* indicates the first index into @handles of an abandoned mutex.
* %WAIT_TIMEOUT - The @timeout interval elapsed and no objects in
* @handles are signalled. %WAIT_FAILED - an error occurred.
* %WAIT_IO_COMPLETION - the wait was ended by an APC.
*/
guint32 WaitForMultipleObjectsEx(guint32 numobjects, gpointer *handles,
gboolean waitall, guint32 timeout,
gboolean alertable)
{
gboolean duplicate = FALSE, bogustype = FALSE, done;
guint32 count, lowest;
guint i;
guint32 ret;
int thr_ret;
gpointer current_thread = wapi_get_current_thread_handle ();
guint32 retval;
gboolean poll;
gpointer sorted_handles [MAXIMUM_WAIT_OBJECTS];
gboolean apc_pending = FALSE;
gint64 now, end;
if (current_thread == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if (numobjects > MAXIMUM_WAIT_OBJECTS) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Too many handles: %d", __func__, numobjects);
return(WAIT_FAILED);
}
if (numobjects == 1) {
return WaitForSingleObjectEx (handles [0], timeout, alertable);
}
/* Check for duplicates */
for (i = 0; i < numobjects; i++) {
if (handles[i] == _WAPI_THREAD_CURRENT) {
handles[i] = wapi_get_current_thread_handle ();
if (handles[i] == NULL) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Handle %d bogus", __func__, i);
bogustype = TRUE;
break;
}
}
if ((GPOINTER_TO_UINT (handles[i]) & _WAPI_PROCESS_UNHANDLED) == _WAPI_PROCESS_UNHANDLED) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Handle %d pseudo process", __func__,
i);
bogustype = TRUE;
break;
}
if (_wapi_handle_test_capabilities (handles[i], WAPI_HANDLE_CAP_WAIT) == FALSE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Handle %p can't be waited for",
__func__, handles[i]);
bogustype = TRUE;
break;
}
sorted_handles [i] = handles [i];
_wapi_handle_ops_prewait (handles[i]);
}
qsort (sorted_handles, numobjects, sizeof (gpointer), g_direct_equal);
for (i = 1; i < numobjects; i++) {
if (sorted_handles [i - 1] == sorted_handles [i]) {
duplicate = TRUE;
break;
}
}
if (duplicate == TRUE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Returning due to duplicates", __func__);
return(WAIT_FAILED);
}
if (bogustype == TRUE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: Returning due to bogus type", __func__);
return(WAIT_FAILED);
}
poll = FALSE;
for (i = 0; i < numobjects; ++i)
if (_wapi_handle_type (handles [i]) == WAPI_HANDLE_PROCESS || _WAPI_SHARED_HANDLE (_wapi_handle_type (handles[i])))
/* Can't wait for a process handle + another handle without polling */
poll = TRUE;
done = test_and_own (numobjects, handles, waitall, &count, &lowest);
if (done == TRUE) {
return(WAIT_OBJECT_0+lowest);
}
if (timeout == 0) {
return WAIT_TIMEOUT;
}
if (timeout != INFINITE)
end = mono_100ns_ticks () + timeout * 1000 * 10;
/* Have to wait for some or all handles to become signalled
*/
for (i = 0; i < numobjects; i++) {
/* Add a reference, as we need to ensure the handle wont
* disappear from under us while we're waiting in the loop
* (not lock, as we don't want exclusive access here)
*/
_wapi_handle_ref (handles[i]);
}
while(1) {
/* Prod all handles with prewait methods and
* special-wait handles that aren't already signalled
*/
for (i = 0; i < numobjects; i++) {
_wapi_handle_ops_prewait (handles[i]);
if (_wapi_handle_test_capabilities (handles[i], WAPI_HANDLE_CAP_SPECIAL_WAIT) == TRUE && _wapi_handle_issignalled (handles[i]) == FALSE) {
_wapi_handle_ops_special_wait (handles[i], 0, alertable);
}
}
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: locking signal mutex", __func__);
thr_ret = _wapi_handle_lock_signal_mutex ();
g_assert (thr_ret == 0);
/* Check the signalled state of handles inside the critical section */
if (waitall) {
done = TRUE;
for (i = 0; i < numobjects; i++)
if (!_wapi_handle_issignalled (handles [i]))
done = FALSE;
} else {
done = FALSE;
for (i = 0; i < numobjects; i++)
if (_wapi_handle_issignalled (handles [i]))
done = TRUE;
}
if (!done) {
/* Enter the wait */
if (timeout == INFINITE) {
ret = _wapi_handle_timedwait_signal (INFINITE, poll, &apc_pending);
} else {
now = mono_100ns_ticks ();
if (end < now) {
ret = WAIT_TIMEOUT;
} else {
ret = _wapi_handle_timedwait_signal ((end - now) / 10 / 1000, poll, &apc_pending);
}
}
} else {
/* No need to wait */
ret = 0;
}
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: unlocking signal mutex", __func__);
thr_ret = _wapi_handle_unlock_signal_mutex (NULL);
g_assert (thr_ret == 0);
if (alertable && apc_pending) {
retval = WAIT_IO_COMPLETION;
break;
}
/* Check if everything is signalled, as we can't
* guarantee to notice a shared signal even if the
* wait timed out
*/
done = test_and_own (numobjects, handles, waitall,
&count, &lowest);
if (done == TRUE) {
retval = WAIT_OBJECT_0+lowest;
break;
} else if (ret != 0) {
/* Didn't get all handles, and there was a
* timeout or other error
*/
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: wait returned error: %s", __func__,
strerror (ret));
if(ret==ETIMEDOUT) {
retval = WAIT_TIMEOUT;
} else {
retval = WAIT_FAILED;
}
break;
}
}
for (i = 0; i < numobjects; i++) {
/* Unref everything we reffed above */
_wapi_handle_unref (handles[i]);
}
return retval;
}
/**
* WaitForSingleObjectEx:
* @handle: an object to wait for
* @timeout: the maximum time in milliseconds to wait for
* @alertable: if TRUE, the wait can be interrupted by an APC call
*
* This function returns when either @handle is signalled, or @timeout
* ms elapses. If @timeout is zero, the object's state is tested and
* the function returns immediately. If @timeout is %INFINITE, the
* function waits forever.
*
* Return value: %WAIT_ABANDONED - @handle is a mutex that was not
* released by the owning thread when it exited. Ownership of the
* mutex object is granted to the calling thread and the mutex is set
* to nonsignalled. %WAIT_OBJECT_0 - The state of @handle is
* signalled. %WAIT_TIMEOUT - The @timeout interval elapsed and
* @handle's state is still not signalled. %WAIT_FAILED - an error
* occurred. %WAIT_IO_COMPLETION - the wait was ended by an APC.
*/
guint32 WaitForSingleObjectEx(gpointer handle, guint32 timeout,
gboolean alertable)
{
guint32 ret, waited;
int thr_ret;
gboolean apc_pending = FALSE;
gpointer current_thread = wapi_get_current_thread_handle ();
gint64 now, end;
if (current_thread == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if (handle == _WAPI_THREAD_CURRENT) {
handle = wapi_get_current_thread_handle ();
if (handle == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
}
if ((GPOINTER_TO_UINT (handle) & _WAPI_PROCESS_UNHANDLED) == _WAPI_PROCESS_UNHANDLED) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if (_wapi_handle_test_capabilities (handle,
WAPI_HANDLE_CAP_WAIT) == FALSE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p can't be waited for", __func__,
handle);
return(WAIT_FAILED);
}
_wapi_handle_ops_prewait (handle);
if (_wapi_handle_test_capabilities (handle, WAPI_HANDLE_CAP_SPECIAL_WAIT) == TRUE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p has special wait", __func__, handle);
ret = _wapi_handle_ops_special_wait (handle, timeout, alertable);
if (alertable && _wapi_thread_cur_apc_pending ())
ret = WAIT_IO_COMPLETION;
return ret;
}
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: locking handle %p", __func__, handle);
thr_ret = _wapi_handle_lock_handle (handle);
g_assert (thr_ret == 0);
if (_wapi_handle_test_capabilities (handle,
WAPI_HANDLE_CAP_OWN) == TRUE) {
if (own_if_owned (handle) == TRUE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p already owned", __func__,
handle);
ret = WAIT_OBJECT_0;
goto done;
}
}
if (own_if_signalled (handle) == TRUE) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p already signalled", __func__,
handle);
ret=WAIT_OBJECT_0;
goto done;
}
if (timeout == 0) {
ret = WAIT_TIMEOUT;
goto done;
}
if (timeout != INFINITE)
end = mono_100ns_ticks () + timeout * 1000 * 10;
do {
/* Check before waiting on the condition, just in case
*/
_wapi_handle_ops_prewait (handle);
if (own_if_signalled (handle)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p signalled", __func__,
handle);
ret = WAIT_OBJECT_0;
goto done;
}
if (timeout == INFINITE) {
waited = _wapi_handle_timedwait_signal_handle (handle, INFINITE, alertable, FALSE, &apc_pending);
} else {
now = mono_100ns_ticks ();
if (end < now) {
ret = WAIT_TIMEOUT;
goto done;
}
waited = _wapi_handle_timedwait_signal_handle (handle, (end - now) / 10 / 1000, alertable, FALSE, &apc_pending);
}
if(waited==0 && !apc_pending) {
/* Condition was signalled, so hopefully
* handle is signalled now. (It might not be
* if someone else got in before us.)
*/
if (own_if_signalled (handle)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p signalled", __func__,
handle);
ret=WAIT_OBJECT_0;
goto done;
}
/* Better luck next time */
}
} while(waited == 0 && !apc_pending);
/* Timeout or other error */
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: wait on handle %p error: %s", __func__, handle,
strerror (waited));
ret = apc_pending ? WAIT_IO_COMPLETION : WAIT_TIMEOUT;
done:
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: unlocking handle %p", __func__, handle);
thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
return(ret);
}
/**
* SignalObjectAndWait:
* @signal_handle: An object to signal
* @wait: An object to wait for
* @timeout: The maximum time in milliseconds to wait for
* @alertable: Specifies whether the function returnes when the system
* queues an I/O completion routine or an APC for the calling thread.
*
* Atomically signals @signal and waits for @wait to become signalled,
* or @timeout ms elapses. If @timeout is zero, the object's state is
* tested and the function returns immediately. If @timeout is
* %INFINITE, the function waits forever.
*
* @signal can be a semaphore, mutex or event object.
*
* If @alertable is %TRUE and the system queues an I/O completion
* routine or an APC for the calling thread, the function returns and
* the thread calls the completion routine or APC function. If
* %FALSE, the function does not return, and the thread does not call
* the completion routine or APC function. A completion routine is
* queued when the ReadFileEx() or WriteFileEx() function in which it
* was specified has completed. The calling thread is the thread that
* initiated the read or write operation. An APC is queued when
* QueueUserAPC() is called. Currently completion routines and APC
* functions are not supported.
*
* Return value: %WAIT_ABANDONED - @wait is a mutex that was not
* released by the owning thread when it exited. Ownershop of the
* mutex object is granted to the calling thread and the mutex is set
* to nonsignalled. %WAIT_IO_COMPLETION - the wait was ended by one
* or more user-mode asynchronous procedure calls queued to the
* thread. %WAIT_OBJECT_0 - The state of @wait is signalled.
* %WAIT_TIMEOUT - The @timeout interval elapsed and @wait's state is
* still not signalled. %WAIT_FAILED - an error occurred.
*/
guint32 SignalObjectAndWait(gpointer signal_handle, gpointer wait,
guint32 timeout, gboolean alertable)
{
guint32 ret = 0, waited;
int thr_ret;
gboolean apc_pending = FALSE;
gpointer current_thread = wapi_get_current_thread_handle ();
gint64 wait_start, timeout_in_ticks;
if (current_thread == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if (signal_handle == _WAPI_THREAD_CURRENT) {
signal_handle = wapi_get_current_thread_handle ();
if (signal_handle == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
}
if (wait == _WAPI_THREAD_CURRENT) {
wait = wapi_get_current_thread_handle ();
if (wait == NULL) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
}
if ((GPOINTER_TO_UINT (signal_handle) & _WAPI_PROCESS_UNHANDLED) == _WAPI_PROCESS_UNHANDLED) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if ((GPOINTER_TO_UINT (wait) & _WAPI_PROCESS_UNHANDLED) == _WAPI_PROCESS_UNHANDLED) {
SetLastError (ERROR_INVALID_HANDLE);
return(WAIT_FAILED);
}
if (mono_w32handle_test_capabilities (signal_handle,
MONO_W32HANDLE_CAP_SIGNAL)==FALSE) {
return(WAIT_FAILED);
}
if (mono_w32handle_test_capabilities (wait,
MONO_W32HANDLE_CAP_WAIT)==FALSE) {
return(WAIT_FAILED);
}
mono_w32handle_ops_prewait (wait);
if (mono_w32handle_test_capabilities (wait, MONO_W32HANDLE_CAP_SPECIAL_WAIT) == TRUE) {
g_warning ("%s: handle %p has special wait, implement me!!",
__func__, wait);
return (WAIT_FAILED);
}
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: locking handle %p", __func__, wait);
thr_ret = mono_w32handle_lock_handle (wait);
g_assert (thr_ret == 0);
mono_w32handle_ops_signal (signal_handle);
if (mono_w32handle_test_capabilities (wait, MONO_W32HANDLE_CAP_OWN)==TRUE) {
if (own_if_owned (wait)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p already owned", __func__,
wait);
ret = WAIT_OBJECT_0;
goto done;
}
}
if (own_if_signalled (wait)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p already signalled", __func__, wait);
ret = WAIT_OBJECT_0;
goto done;
}
if (timeout != INFINITE) {
wait_start = mono_100ns_ticks ();
timeout_in_ticks = (gint64)timeout * 10 * 1000; //can't overflow as timeout is 32bits
}
do {
/* Check before waiting on the condition, just in case
*/
mono_w32handle_ops_prewait (wait);
if (own_if_signalled (wait)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p signalled", __func__, wait);
ret = WAIT_OBJECT_0;
goto done;
}
if (timeout == INFINITE) {
waited = mono_w32handle_timedwait_signal_handle (wait, INFINITE, FALSE, alertable ? &apc_pending : NULL);
} else {
gint64 elapsed = mono_100ns_ticks () - wait_start;
if (elapsed >= timeout_in_ticks) {
ret = WAIT_TIMEOUT;
goto done;
}
waited = mono_w32handle_timedwait_signal_handle (wait, (timeout_in_ticks - elapsed) / 10 / 1000, FALSE, alertable ? &apc_pending : NULL);
}
if (waited==0 && !apc_pending) {
/* Condition was signalled, so hopefully
* handle is signalled now. (It might not be
* if someone else got in before us.)
*/
if (own_if_signalled (wait)) {
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: handle %p signalled", __func__,
wait);
ret = WAIT_OBJECT_0;
goto done;
}
/* Better luck next time */
}
} while(waited == 0 && !apc_pending);
/* Timeout or other error */
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: wait on handle %p error: %s", __func__, wait, strerror (ret));
ret = apc_pending ? WAIT_IO_COMPLETION : WAIT_TIMEOUT;
done:
MONO_TRACE (G_LOG_LEVEL_DEBUG, MONO_TRACE_IO_LAYER, "%s: unlocking handle %p", __func__, wait);
thr_ret = mono_w32handle_unlock_handle (wait);
g_assert (thr_ret == 0);
return(ret);
}
