* Author:
* Dick Porter (dick@ximian.com)
*
- * (C) 2002 Ximian, Inc.
+ * (C) 2002-2006 Ximian, Inc.
*/
#include <config.h>
static void namedmutex_signal (gpointer handle);
static gboolean namedmutex_own (gpointer handle);
static gboolean namedmutex_is_owned (gpointer handle);
+static void namedmutex_prewait (gpointer handle);
struct _WapiHandleOps _wapi_mutex_ops = {
NULL, /* close */
mutex_signal, /* signal */
mutex_own, /* own */
mutex_is_owned, /* is_owned */
+ NULL, /* special_wait */
+ NULL /* prewait */
};
void _wapi_mutex_details (gpointer handle_info)
namedmutex_signal, /* signal */
namedmutex_own, /* own */
namedmutex_is_owned, /* is_owned */
+ NULL, /* special_wait */
+ namedmutex_prewait /* prewait */
};
static gboolean mutex_release (gpointer handle);
return(FALSE);
}
- _wapi_thread_own_mutex (pthread_self (), handle);
+ _wapi_thread_own_mutex (handle);
#ifdef DEBUG
g_message("%s: owning mutex handle %p", __func__, handle);
_wapi_handle_set_signal_state (handle, FALSE, FALSE);
- mutex_handle->pid = getpid ();
+ mutex_handle->pid = _wapi_getpid ();
mutex_handle->tid = pthread_self ();
mutex_handle->recursion++;
#endif
if (mutex_handle->recursion > 0 &&
- mutex_handle->pid == getpid () &&
- mutex_handle->tid == pthread_self ()) {
+ mutex_handle->pid == _wapi_getpid () &&
+ pthread_equal (mutex_handle->tid, pthread_self ())) {
#ifdef DEBUG
g_message ("%s: mutex handle %p owned by %d:%ld", __func__,
- handle, getpid (), pthread_self ());
+ handle, _wapi_getpid (), pthread_self ());
#endif
return(TRUE);
} else {
#ifdef DEBUG
- g_message ("%s: mutex handle %p not owned by %d:%ld, but locked %d times by %d:%ld", __func__, handle, getpid (), pthread_self (), mutex_handle->recursion, mutex_handle->pid, mutex_handle->tid);
+ g_message ("%s: mutex handle %p not owned by %d:%ld, but locked %d times by %d:%ld", __func__, handle, _wapi_getpid (), pthread_self (), mutex_handle->recursion, mutex_handle->pid, mutex_handle->tid);
#endif
return(FALSE);
return(FALSE);
}
- _wapi_thread_own_mutex (pthread_self (), handle);
+ _wapi_thread_own_mutex (handle);
- namedmutex_handle->pid = getpid ();
+ namedmutex_handle->pid = _wapi_getpid ();
namedmutex_handle->tid = pthread_self ();
namedmutex_handle->recursion++;
#endif
if (namedmutex_handle->recursion > 0 &&
- namedmutex_handle->pid == getpid () &&
- namedmutex_handle->tid == pthread_self ()) {
+ namedmutex_handle->pid == _wapi_getpid () &&
+ pthread_equal (namedmutex_handle->tid, pthread_self ())) {
#ifdef DEBUG
g_message ("%s: mutex handle %p owned by %d:%ld", __func__,
- handle, getpid (), pthread_self ());
+ handle, _wapi_getpid (), pthread_self ());
#endif
return(TRUE);
} else {
#ifdef DEBUG
- g_message ("%s: mutex handle %p not owned by %d:%ld, but locked %d times by %d:%ld", __func__, handle, getpid (), pthread_self (), namedmutex_handle->recursion, namedmutex_handle->pid, namedmutex_handle->tid);
+ g_message ("%s: mutex handle %p not owned by %d:%ld, but locked %d times by %d:%ld", __func__, handle, _wapi_getpid (), pthread_self (), namedmutex_handle->recursion, namedmutex_handle->pid, namedmutex_handle->tid);
#endif
return(FALSE);
}
}
+/* The shared state is not locked when prewait methods are called */
+static void namedmutex_prewait (gpointer handle)
+{
+ /* If the mutex is not currently owned, do nothing and let the
+ * usual wait carry on. If it is owned, check that the owner
+ * is still alive; if it isn't we override the previous owner
+ * and assume that process exited abnormally and failed to
+ * clean up.
+ */
+ struct _WapiHandle_namedmutex *namedmutex_handle;
+ gboolean ok;
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_NAMEDMUTEX,
+ (gpointer *)&namedmutex_handle);
+ if (ok == FALSE) {
+ g_warning ("%s: error looking up named mutex handle %p",
+ __func__, handle);
+ return;
+ }
+
+#ifdef DEBUG
+ g_message ("%s: Checking ownership of named mutex handle %p", __func__,
+ handle);
+#endif
+
+ if (namedmutex_handle->recursion == 0) {
+#ifdef DEBUG
+ g_message ("%s: Named mutex handle %p not owned", __func__,
+ handle);
+#endif
+ } else if (namedmutex_handle->pid == _wapi_getpid ()) {
+#ifdef DEBUG
+ g_message ("%s: Named mutex handle %p owned by this process",
+ __func__, handle);
+#endif
+ } else {
+ guint32 *pids = g_new0 (guint32, 32);
+ guint32 count = 32, needed_bytes, i;
+ gboolean ret;
+ int thr_ret;
+
+#ifdef DEBUG
+ g_message ("%s: Named mutex handle %p owned by another process", __func__, handle);
+#endif
+
+ ret = EnumProcesses (pids, count * sizeof(guint32),
+ &needed_bytes);
+ if (ret == FALSE) {
+ do {
+ count = needed_bytes / sizeof(guint32);
+#ifdef DEBUG
+ g_message ("%s: Retrying pid lookup with %d slots", __func__, count);
+#endif
+ pids = g_renew (guint32, pids, count);
+ ret = EnumProcesses (pids, needed_bytes,
+ &needed_bytes);
+ } while (ret == FALSE);
+ }
+
+ count = needed_bytes / sizeof(guint32);
+
+#ifdef DEBUG
+ g_message ("%s: Need to look at %d pids for named mutex handle %p", __func__, count, handle);
+#endif
+
+ thr_ret = _wapi_handle_lock_shared_handles ();
+ g_assert (thr_ret == 0);
+
+ for (i = 0; i < count; i++) {
+#ifdef DEBUG
+ g_message ("%s: Checking pid %d for named mutex handle %p", __func__, pids[i], handle);
+#endif
+
+ if (pids[i] == namedmutex_handle->pid) {
+ /* Must be still alive, because
+ * EnumProcesses() checks for us
+ */
+#ifdef DEBUG
+ g_message ("%s: Found active pid %d for named mutex handle %p", __func__, pids[i], handle);
+#endif
+
+ break;
+ }
+ }
+
+ g_free (pids);
+
+ if (i == count) {
+ /* Didn't find the process that this handle
+ * was owned by, overriding it
+ */
+
+#ifdef DEBUG
+ g_message ("%s: overriding old owner of named mutex handle %p", __func__, handle);
+#endif
+
+ namedmutex_handle->pid = 0;
+ namedmutex_handle->tid = 0;
+ namedmutex_handle->recursion = 0;
+
+ _wapi_shared_handle_set_signal_state (handle, TRUE);
+ }
+
+ _wapi_handle_unlock_shared_handles ();
+ }
+}
+
static void mutex_abandon (gpointer handle, pid_t pid, pthread_t tid)
{
struct _WapiHandle_mutex *mutex_handle;
g_assert (thr_ret == 0);
if (mutex_handle->pid == pid &&
- mutex_handle->tid == tid) {
+ pthread_equal (mutex_handle->tid, tid)) {
#ifdef DEBUG
g_message ("%s: Mutex handle %p abandoned!", __func__, handle);
#endif
g_assert (thr_ret == 0);
if (mutex_handle->pid == pid &&
- mutex_handle->tid == tid) {
+ pthread_equal (mutex_handle->tid, tid)) {
#ifdef DEBUG
g_message ("%s: Mutex handle %p abandoned!", __func__, handle);
#endif
guint32 namelen;
gint32 offset;
- /* w32 seems to guarantee that opening named mutexes can't
+ /* w32 seems to guarantee that opening named objects can't
* race each other
*/
- pthread_cleanup_push ((void(*)(void *))_wapi_namespace_unlock, NULL);
thr_ret = _wapi_namespace_lock ();
g_assert (thr_ret == 0);
SetLastError (ERROR_ALREADY_EXISTS);
}
/* Fall through to create the mutex handle. */
-
- if (strlen (utf8_name) < MAX_PATH) {
- namelen = strlen (utf8_name);
- } else {
- namelen = MAX_PATH;
- }
-
- memcpy (&namedmutex_handle.sharedns.name, utf8_name, namelen);
if (offset == 0) {
/* A new named mutex, so create both the private and
* shared parts
*/
+
+ if (strlen (utf8_name) < MAX_PATH) {
+ namelen = strlen (utf8_name);
+ } else {
+ namelen = MAX_PATH;
+ }
+
+ memcpy (&namedmutex_handle.sharedns.name, utf8_name, namelen);
+
handle = _wapi_handle_new (WAPI_HANDLE_NAMEDMUTEX,
&namedmutex_handle);
} else {
g_free (utf8_name);
_wapi_namespace_unlock (NULL);
- pthread_cleanup_pop (0);
return(ret);
}
{
struct _WapiHandle_mutex *mutex_handle;
gboolean ok;
- pthread_t tid=pthread_self();
- pid_t pid=getpid ();
+ pthread_t tid = pthread_self ();
+ pid_t pid = _wapi_getpid ();
int thr_ret;
gboolean ret = FALSE;
g_message("%s: Releasing mutex handle %p", __func__, handle);
#endif
- if(mutex_handle->tid!=tid || mutex_handle->pid!=pid) {
+ if (!pthread_equal (mutex_handle->tid, tid) ||
+ mutex_handle->pid != pid) {
#ifdef DEBUG
- g_message("%s: We don't own mutex handle %p (owned by %d:%ld, me %d:%ld)", __func__, handle, mutex_handle->pid, mutex_handle->tid, pid, tid);
+ g_message("%s: We don't own mutex handle %p (owned by %d:%ld, me %d:%ld)", __func__, handle, mutex_handle->pid, mutex_handle->tid, _wapi_getpid (), tid);
#endif
goto cleanup;
mutex_handle->recursion--;
if(mutex_handle->recursion==0) {
- _wapi_thread_disown_mutex (tid, handle);
+ _wapi_thread_disown_mutex (handle);
#ifdef DEBUG
g_message("%s: Unlocking mutex handle %p", __func__, handle);
{
struct _WapiHandle_namedmutex *mutex_handle;
gboolean ok;
- pthread_t tid=pthread_self();
- pid_t pid=getpid ();
+ pthread_t tid = pthread_self ();
+ pid_t pid = _wapi_getpid ();
int thr_ret;
gboolean ret = FALSE;
g_message("%s: Releasing mutex handle %p", __func__, handle);
#endif
- if(mutex_handle->tid!=tid || mutex_handle->pid!=pid) {
+ if (!pthread_equal (mutex_handle->tid, tid) ||
+ mutex_handle->pid != pid) {
#ifdef DEBUG
- g_message("%s: We don't own mutex handle %p (owned by %d:%ld, me %d:%ld)", __func__, handle, mutex_handle->pid, mutex_handle->tid, pid, tid);
+ g_message("%s: We don't own mutex handle %p (owned by %d:%ld, me %d:%ld)", __func__, handle, mutex_handle->pid, mutex_handle->tid, _wapi_getpid (), tid);
#endif
goto cleanup;
mutex_handle->recursion--;
if(mutex_handle->recursion==0) {
- _wapi_thread_disown_mutex (tid, handle);
+ _wapi_thread_disown_mutex (handle);
#ifdef DEBUG
g_message("%s: Unlocking mutex handle %p", __func__, handle);
return(mutex_ops[type].release (handle));
}
+
+gpointer OpenMutex (guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, const gunichar2 *name)
+{
+ gpointer handle;
+ gchar *utf8_name;
+ int thr_ret;
+ gpointer ret = NULL;
+ gint32 offset;
+
+ mono_once (&mutex_ops_once, mutex_ops_init);
+
+ /* w32 seems to guarantee that opening named objects can't
+ * race each other
+ */
+ thr_ret = _wapi_namespace_lock ();
+ g_assert (thr_ret == 0);
+
+ utf8_name = g_utf16_to_utf8 (name, -1, NULL, NULL, NULL);
+
+#ifdef DEBUG
+ g_message ("%s: Opening named mutex [%s]", __func__, utf8_name);
+#endif
+
+ offset = _wapi_search_handle_namespace (WAPI_HANDLE_NAMEDMUTEX,
+ utf8_name);
+ if (offset == -1) {
+ /* The name has already been used for a different
+ * object.
+ */
+ SetLastError (ERROR_INVALID_HANDLE);
+ goto cleanup;
+ } else if (offset == 0) {
+ /* This name doesn't exist */
+ SetLastError (ERROR_FILE_NOT_FOUND); /* yes, really */
+ goto cleanup;
+ }
+
+ /* A new reference to an existing named mutex, so just create
+ * the private part
+ */
+ handle = _wapi_handle_new_from_offset (WAPI_HANDLE_NAMEDMUTEX, offset,
+ TRUE);
+
+ if (handle == _WAPI_HANDLE_INVALID) {
+ g_warning ("%s: error opening named mutex handle", __func__);
+ SetLastError (ERROR_GEN_FAILURE);
+ goto cleanup;
+ }
+ ret = handle;
+
+#ifdef DEBUG
+ g_message ("%s: returning named mutex handle %p", __func__, handle);
+#endif
+
+cleanup:
+ g_free (utf8_name);
+
+ _wapi_namespace_unlock (NULL);
+
+ return(ret);
+}
projects / mono.git / blobdiff