+/*
+ * wait.c: wait for handles to become signalled
+ *
+ * Author:
+ * Dick Porter (dick@ximian.com)
+ *
+ * (C) 2002 Ximian, Inc.
+ */
+
#include <config.h>
#include <glib.h>
#include <string.h>
+#include <errno.h>
#if HAVE_BOEHM_GC
#include <gc/gc.h>
#endif
-#include "mono/io-layer/wapi.h"
-#include "wait-private.h"
-#include "timed-thread.h"
-#include "handles-private.h"
-#include "wapi-private.h"
-
-#include "mono-mutex.h"
+#include <mono/io-layer/wapi.h>
+#include <mono/io-layer/handles-private.h>
+#include <mono/io-layer/wapi-private.h>
+#include <mono/io-layer/mono-mutex.h>
+#include <mono/io-layer/misc-private.h>
#undef DEBUG
-static pthread_once_t wait_once=PTHREAD_ONCE_INIT;
-
-static GPtrArray *WaitQueue=NULL;
-
-static pthread_t wait_monitor_thread_id;
-static gboolean wait_monitor_thread_running=FALSE;
-static mono_mutex_t wait_monitor_mutex=MONO_MUTEX_INITIALIZER;
-static sem_t wait_monitor_sem;
-
-static void launch_tidy(guint32 exitcode G_GNUC_UNUSED, gpointer user)
+/**
+ * WaitForSingleObject:
+ * @handle: an object to wait for
+ * @timeout: the maximum time in milliseconds to wait for
+ *
+ * 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.
+ */
+guint32 WaitForSingleObject(gpointer handle, guint32 timeout)
{
- WaitQueueItem *item=(WaitQueueItem *)user;
+ guint32 ret, waited;
+ struct timespec abstime;
+ if(_wapi_handle_test_capabilities (handle,
+ WAPI_HANDLE_CAP_WAIT)==FALSE) {
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION ": Informing monitor thread");
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p can't be waited for", handle);
#endif
- /* Update queue item */
- mono_mutex_lock(&item->mutex);
- item->update++;
- mono_mutex_unlock(&item->mutex);
-
- /* Signal monitor */
- sem_post(&wait_monitor_sem);
-}
-
-/* This function is called by the monitor thread to launch handle-type
- * specific threads to block in particular ways.
- *
- * The item mutex is held by the monitor thread when this function is
- * called.
- */
-static void launch_blocker_threads(WaitQueueItem *item)
-{
- int i, ret;
+ return(WAIT_FAILED);
+ }
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION ": Launching blocker threads");
+ g_message (G_GNUC_PRETTY_FUNCTION ": locking handle %p", handle);
#endif
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- if(item->handles[i]->len>0) {
- WapiHandle *handle;
+ _wapi_handle_lock_handle (handle);
- handle=g_ptr_array_index(item->handles[i], 0);
- g_assert(handle!=NULL);
- g_assert(handle->ops->wait_multiple!=NULL);
-
+ if(_wapi_handle_test_capabilities (handle,
+ WAPI_HANDLE_CAP_OWN)==TRUE) {
+ if(_wapi_handle_ops_isowned (handle)==TRUE) {
#ifdef DEBUG
- g_message("Handle type %d active", i);
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p already owned", handle);
#endif
- item->waited[i]=FALSE;
-
- ret=_wapi_timed_thread_create(
- &item->thread[i], NULL,
- handle->ops->wait_multiple, launch_tidy, item,
- item);
- if(ret!=0) {
- g_warning(G_GNUC_PRETTY_FUNCTION
- ": Thread create error: %s",
- strerror(ret));
- return;
- }
- } else {
- /* Pretend to have already waited for the
- * thread; it makes life easier for the
- * monitor thread.
- */
- item->waited[i]=TRUE;
+ _wapi_handle_ops_own (handle);
+ ret=WAIT_OBJECT_0;
+ goto done;
}
}
-}
-
-static gboolean launch_threads_done(WaitQueueItem *item)
-{
- int i;
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- if(item->waited[i]==FALSE) {
- return(FALSE);
- }
- }
+ if(_wapi_handle_issignalled (handle)) {
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p already signalled", handle);
+#endif
- return(TRUE);
-}
+ _wapi_handle_ops_own (handle);
+ ret=WAIT_OBJECT_0;
+ goto done;
+ }
-/* This is the main loop for the monitor thread. It waits for a
- * signal to check the wait queue, then takes any action necessary on
- * any queue items that have indicated readiness.
- */
-static void *wait_monitor_thread(void *unused G_GNUC_UNUSED)
-{
- guint i;
-
- /* Signal that the monitor thread is ready */
- wait_monitor_thread_running=TRUE;
+ /* Have to wait for it */
+ if(timeout!=INFINITE) {
+ _wapi_calc_timeout (&abstime, timeout);
+ }
- while(TRUE) {
- /* Use a semaphore rather than a cond so we dont miss
- * any signals
- */
- sem_wait(&wait_monitor_sem);
-
+ do {
+ if(timeout==INFINITE) {
+ waited=_wapi_handle_wait_signal_handle (handle);
+ } else {
+ waited=_wapi_handle_timedwait_signal_handle (handle,
+ &abstime);
+ }
+
+ if(waited==0) {
+ /* Condition was signalled, so hopefully
+ * handle is signalled now. (It might not be
+ * if someone else got in before us.)
+ */
+ if(_wapi_handle_issignalled (handle)) {
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION
- ": Blocking thread doing stuff");
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p signalled", handle);
#endif
-
- /* We've been signalled, so scan the wait queue for
- * activity.
- */
- mono_mutex_lock(&wait_monitor_mutex);
- for(i=0; i<WaitQueue->len; i++) {
- WaitQueueItem *item=g_ptr_array_index(WaitQueue, i);
-
- if(item->update > item->ack) {
- /* Something changed */
- mono_mutex_lock(&item->mutex);
- item->ack=item->update;
-
- switch(item->state) {
- case WQ_NEW:
- /* Launch a new thread for each type of
- * handle to be waited for here.
- */
- launch_blocker_threads(item);
-
- item->state=WQ_WAITING;
- break;
-
- case WQ_WAITING:
- /* See if we have waited for
- * the last blocker thread.
- */
- if(launch_threads_done(item)) {
- /* All handles have
- * been signalled, so
- * signal the waiting
- * thread. Let the
- * waiting thread
- * remove this item
- * from the queue,
- * because it makes
- * the logic a lot
- * easier here.
- */
- item->state=WQ_SIGNALLED;
- sem_post(&item->wait_sem);
- }
- break;
-
- case WQ_SIGNALLED:
- /* This shouldn't happen. Prod
- * the blocking thread again
- * just to make sure.
- */
- g_warning(G_GNUC_PRETTY_FUNCTION
- ": Prodding blocker again");
- sem_post(&item->wait_sem);
- break;
- }
-
- mono_mutex_unlock(&item->mutex);
+
+ _wapi_handle_ops_own (handle);
+ ret=WAIT_OBJECT_0;
+ goto done;
}
+
+ /* Better luck next time */
}
+ } while(waited==0);
- mono_mutex_unlock(&wait_monitor_mutex);
- }
-
- return(NULL);
-}
-
-static void wait_init(void)
-{
- int ret;
-
+ /* Timeout or other error */
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION ": Starting monitor thread");
+ g_message (G_GNUC_PRETTY_FUNCTION ": wait on handle %p error: %s",
+ handle, strerror (ret));
#endif
-
- WaitQueue=g_ptr_array_new();
-
- sem_init(&wait_monitor_sem, 0, 0);
-
- /* Launch a thread which manages the wait queue, and deals
- * with waiting for handles of various types.
- */
- ret=pthread_create(&wait_monitor_thread_id, NULL,
- wait_monitor_thread, NULL);
- if(ret!=0) {
- g_warning(G_GNUC_PRETTY_FUNCTION
- ": Couldn't start handle monitor thread: %s",
- strerror(ret));
- }
-
- /* Wait for the monitor thread to get going */
- while(wait_monitor_thread_running==FALSE) {
- sched_yield();
- }
-}
-static WaitQueueItem *wait_item_new(guint32 timeout, gboolean waitall)
-{
- WaitQueueItem *new;
- int i;
-
- new=g_new0(WaitQueueItem, 1);
-
- mono_mutex_init(&new->mutex, NULL);
- sem_init(&new->wait_sem, 0, 0);
-
- new->update=1; /* As soon as this item is queued it
- * will need attention.
- */
- new->state=WQ_NEW;
- new->timeout=timeout;
- new->waitall=waitall;
- new->lowest_signal=MAXIMUM_WAIT_OBJECTS;
+ ret=WAIT_TIMEOUT;
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- new->handles[i]=g_ptr_array_new();
- new->waitindex[i]=g_array_new(FALSE, FALSE, sizeof(guint32));
- }
+done:
+
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handle %p", handle);
+#endif
- return(new);
+ _wapi_handle_unlock_handle (handle);
+ return(ret);
}
-/* Adds our queue item to the work queue, and blocks until the monitor
- * thread thinks it's done the work. Returns TRUE for done, FALSE for
- * timed out. Sets lowest to the index of the first signalled handle
- * in the list.
+/**
+ * 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.
*/
-static gboolean wait_for_item(WaitQueueItem *item, guint32 *lowest)
+guint32 SignalObjectAndWait(gpointer signal_handle, gpointer wait,
+ guint32 timeout, gboolean alertable)
{
- gboolean ret;
- int i;
-
- /* Add the wait item to the monitor queue, and signal the
- * monitor thread */
- mono_mutex_lock(&wait_monitor_mutex);
- g_ptr_array_add(WaitQueue, item);
- sem_post(&wait_monitor_sem);
- mono_mutex_unlock(&wait_monitor_mutex);
-
- /* Wait for the item to become ready */
- sem_wait(&item->wait_sem);
+ guint32 ret, waited;
+ struct timespec abstime;
- mono_mutex_lock(&item->mutex);
+ if(_wapi_handle_test_capabilities (signal_handle,
+ WAPI_HANDLE_CAP_SIGNAL)==FALSE) {
+ return(WAIT_FAILED);
+ }
- /* If waitall is TRUE, then the number signalled in each handle type
- * must be the length of the handle type array for the wait to be
- * successful. Otherwise, any signalled handle is good enough
- */
- if(item->waitall==TRUE) {
- ret=TRUE;
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- if(item->waitcount[i]!=item->handles[i]->len) {
- ret=FALSE;
- break;
- }
- }
- } else {
- ret=FALSE;
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- if(item->waitcount[i]>0) {
- ret=TRUE;
- break;
- }
- }
+ if(_wapi_handle_test_capabilities (wait,
+ WAPI_HANDLE_CAP_WAIT)==FALSE) {
+ return(WAIT_FAILED);
}
- *lowest=item->lowest_signal;
-
- mono_mutex_unlock(&item->mutex);
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": locking handle %p", wait);
+#endif
- return(ret);
-}
+ _wapi_handle_lock_handle (wait);
-static gboolean wait_dequeue_item(WaitQueueItem *item)
-{
- gboolean ret;
-
- g_assert(WaitQueue!=NULL);
-
- mono_mutex_lock(&wait_monitor_mutex);
- ret=g_ptr_array_remove_fast(WaitQueue, item);
- mono_mutex_unlock(&wait_monitor_mutex);
-
- return(ret);
-}
+ _wapi_handle_ops_signal (signal_handle);
-static void wait_item_destroy(WaitQueueItem *item)
-{
- int i;
-
- mono_mutex_destroy(&item->mutex);
- sem_destroy(&item->wait_sem);
-
- for(i=0; i<WAPI_HANDLE_COUNT; i++) {
- if(item->thread[i]!=NULL) {
- g_free(item->thread[i]);
+ if(_wapi_handle_test_capabilities (wait, WAPI_HANDLE_CAP_OWN)==TRUE) {
+ if(_wapi_handle_ops_isowned (wait)==TRUE) {
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p already owned", wait);
+#endif
+ _wapi_handle_ops_own (wait);
+ ret=WAIT_OBJECT_0;
+ goto done;
}
- g_ptr_array_free(item->handles[i], FALSE);
- g_array_free(item->waitindex[i], FALSE);
}
-}
+
+ if(_wapi_handle_issignalled (wait)) {
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p already signalled", wait);
+#endif
+ _wapi_handle_ops_own (wait);
+ ret=WAIT_OBJECT_0;
+ goto done;
+ }
-/**
- * WaitForSingleObject:
- * @handle: an object to wait for
- * @timeout: the maximum time in milliseconds to wait for
- *
- * 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.
- */
-guint32 WaitForSingleObject(WapiHandle *handle, guint32 timeout)
-{
- gboolean wait;
-
- if(handle->ops->wait==NULL) {
- return(WAIT_FAILED);
+ /* Have to wait for it */
+ if(timeout!=INFINITE) {
+ _wapi_calc_timeout (&abstime, timeout);
}
+
+ do {
+ if(timeout==INFINITE) {
+ waited=_wapi_handle_wait_signal_handle (wait);
+ } else {
+ waited=_wapi_handle_timedwait_signal_handle (wait,
+ &abstime);
+ }
+
+ if(waited==0) {
+ /* Condition was signalled, so hopefully
+ * handle is signalled now. (It might not be
+ * if someone else got in before us.)
+ */
+ if(_wapi_handle_issignalled (wait)) {
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": handle %p signalled", wait);
+#endif
- wait=handle->ops->wait(handle, NULL, timeout);
- if(wait==TRUE) {
- /* Object signalled before timeout expired */
+ _wapi_handle_ops_own (wait);
+ ret=WAIT_OBJECT_0;
+ goto done;
+ }
+
+ /* Better luck next time */
+ }
+ } while(waited==0);
+
+ /* Timeout or other error */
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION ": Object %p signalled",
- handle);
+ g_message (G_GNUC_PRETTY_FUNCTION ": wait on handle %p error: %s",
+ wait, strerror (ret));
#endif
- return(WAIT_OBJECT_0);
- } else {
+
+ ret=WAIT_TIMEOUT;
+
+done:
+
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION ": Object %p wait timed out",
- handle);
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handle %p", wait);
#endif
- return(WAIT_TIMEOUT);
+
+ _wapi_handle_unlock_handle (wait);
+
+ if(alertable==TRUE) {
+ /* Deal with queued APC or IO completion routines */
}
+
+ return(ret);
}
/**
* %WAIT_TIMEOUT - The @timeout interval elapsed and no objects in
* @handles are signalled. %WAIT_FAILED - an error occurred.
*/
-guint32 WaitForMultipleObjects(guint32 numobjects, WapiHandle **handles,
+guint32 WaitForMultipleObjects(guint32 numobjects, gpointer *handles,
gboolean waitall, guint32 timeout)
{
- WaitQueueItem *item;
GHashTable *dups;
- gboolean duplicate=FALSE, bogustype=FALSE;
- gboolean wait;
+ gboolean duplicate=FALSE, bogustype=FALSE, done;
+ guint32 count, lowest;
+ struct timespec abstime;
guint i;
- guint32 lowest;
-
- pthread_once(&wait_once, wait_init);
+ guint32 ret;
if(numobjects>MAXIMUM_WAIT_OBJECTS) {
#ifdef DEBUG
break;
}
- if(handles[i]->ops->wait_multiple==NULL) {
+ if(_wapi_handle_test_capabilities (handles[i], WAPI_HANDLE_CAP_WAIT)==FALSE) {
#ifdef DEBUG
- g_message(G_GNUC_PRETTY_FUNCTION
- ": Handle %p can't be waited for (type %d)",
- handles[i], handles[i]->type);
+ g_message (G_GNUC_PRETTY_FUNCTION
+ ": Handle %p can't be waited for",
+ handles[i]);
#endif
bogustype=TRUE;
return(WAIT_FAILED);
}
-
- item=wait_item_new(timeout, waitall);
- /* Sort the handles by type */
- for(i=0; i<numobjects; i++) {
- g_ptr_array_add(item->handles[handles[i]->type], handles[i]);
- g_array_append_val(item->waitindex[handles[i]->type], i);
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": locking handles");
+#endif
+
+ done=_wapi_handle_count_signalled_handles (numobjects, handles,
+ waitall, &count, &lowest);
+ if(done==TRUE) {
+ for(i=0; i<numobjects; i++) {
+ _wapi_handle_ops_own (handles[i]);
+ }
+
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handles");
+#endif
+
+ _wapi_handle_unlock_handles (numobjects, handles);
+ return(WAIT_OBJECT_0+lowest);
}
- wait=wait_for_item(item, &lowest);
- wait_dequeue_item(item);
- wait_item_destroy(item);
+ /* Have to wait for some or all handles to become signalled
+ */
- if(wait==FALSE) {
- /* Wait timed out */
- return(WAIT_TIMEOUT);
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handles");
+#endif
+
+ _wapi_handle_unlock_handles (numobjects, handles);
+
+ if(timeout!=INFINITE) {
+ _wapi_calc_timeout (&abstime, timeout);
}
- return(WAIT_OBJECT_0+lowest);
+ while(1) {
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": locking signal mutex");
+#endif
+
+ _wapi_handle_lock_signal_mutex ();
+
+ if(timeout==INFINITE) {
+ ret=_wapi_handle_wait_signal ();
+ } else {
+ ret=_wapi_handle_timedwait_signal (&abstime);
+ }
+
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking signal mutex");
+#endif
+
+ _wapi_handle_unlock_signal_mutex ();
+
+ if(ret==0) {
+ /* Something was signalled ... */
+ done=_wapi_handle_count_signalled_handles (numobjects,
+ handles,
+ waitall,
+ &count,
+ &lowest);
+ if(done==TRUE) {
+ for(i=0; i<numobjects; i++) {
+ _wapi_handle_ops_own (handles[i]);
+ }
+
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handles");
+#endif
+
+ _wapi_handle_unlock_handles (numobjects,
+ handles);
+
+ return(WAIT_OBJECT_0+lowest);
+ }
+
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": unlocking handles");
+#endif
+
+ _wapi_handle_unlock_handles (numobjects, handles);
+ } else {
+ /* Timeout or other error */
+#ifdef DEBUG
+ g_message (G_GNUC_PRETTY_FUNCTION ": wait returned error: %s", strerror (ret));
+#endif
+
+ if(ret==ETIMEDOUT) {
+ return(WAIT_TIMEOUT);
+ } else {
+ return(WAIT_FAILED);
+ }
+ }
+ }
}
projects / mono.git / blobdiff