* Author:
* Dick Porter (dick@ximian.com)
*
- * (C) 2002 Ximian, Inc.
+ * (C) 2002-2006 Ximian, Inc.
*/
#include <config.h>
#include <mono/io-layer/wapi-private.h>
#include <mono/io-layer/misc-private.h>
#include <mono/io-layer/handles-private.h>
-#include <mono/io-layer/mono-mutex.h>
#include <mono/io-layer/mutex-private.h>
+#include <mono/utils/mono-mutex.h>
-#undef DEBUG
+#if 0
+#define DEBUG(...) g_message(__VA_ARGS__)
+#else
+#define DEBUG(...)
+#endif
static void mutex_signal(gpointer handle);
static gboolean mutex_own (gpointer handle);
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);
_wapi_thread_own_mutex (handle);
-#ifdef DEBUG
- g_message("%s: owning mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%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++;
-#ifdef DEBUG
- g_message ("%s: mutex handle %p locked %d times by %d:%ld", __func__,
+ DEBUG ("%s: mutex handle %p locked %d times by %d:%ld", __func__,
handle, mutex_handle->recursion, mutex_handle->pid,
mutex_handle->tid);
-#endif
return(TRUE);
}
return(FALSE);
}
-#ifdef DEBUG
- g_message("%s: testing ownership mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%s: testing ownership mutex handle %p", __func__, handle);
if (mutex_handle->recursion > 0 &&
- mutex_handle->pid == getpid () &&
- mutex_handle->tid == pthread_self ()) {
-#ifdef DEBUG
- g_message ("%s: mutex handle %p owned by %d:%ld", __func__,
- handle, getpid (), pthread_self ());
-#endif
+ mutex_handle->pid == _wapi_getpid () &&
+ pthread_equal (mutex_handle->tid, pthread_self ())) {
+ DEBUG ("%s: mutex handle %p owned by %d:%ld", __func__,
+ handle, _wapi_getpid (), pthread_self ());
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);
-#endif
+ DEBUG ("%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);
return(FALSE);
}
struct _WapiHandle_namedmutex *namedmutex_handle;
gboolean ok;
-#ifdef DEBUG
- g_message ("%s: owning named mutex handle %p", __func__, handle);
-#endif
+ DEBUG ("%s: owning named mutex handle %p", __func__, handle);
ok = _wapi_lookup_handle (handle, WAPI_HANDLE_NAMEDMUTEX,
(gpointer *)&namedmutex_handle);
_wapi_thread_own_mutex (handle);
- namedmutex_handle->pid = getpid ();
+ namedmutex_handle->pid = _wapi_getpid ();
namedmutex_handle->tid = pthread_self ();
namedmutex_handle->recursion++;
_wapi_shared_handle_set_signal_state (handle, FALSE);
-#ifdef DEBUG
- g_message ("%s: mutex handle %p locked %d times by %d:%ld", __func__,
+ DEBUG ("%s: mutex handle %p locked %d times by %d:%ld", __func__,
handle, namedmutex_handle->recursion,
namedmutex_handle->pid, namedmutex_handle->tid);
-#endif
return(TRUE);
}
return(FALSE);
}
-#ifdef DEBUG
- g_message ("%s: testing ownership mutex handle %p", __func__, handle);
-#endif
+ DEBUG ("%s: testing ownership mutex handle %p", __func__, handle);
if (namedmutex_handle->recursion > 0 &&
- namedmutex_handle->pid == getpid () &&
- namedmutex_handle->tid == pthread_self ()) {
-#ifdef DEBUG
- g_message ("%s: mutex handle %p owned by %d:%ld", __func__,
- handle, getpid (), pthread_self ());
-#endif
+ namedmutex_handle->pid == _wapi_getpid () &&
+ pthread_equal (namedmutex_handle->tid, pthread_self ())) {
+ DEBUG ("%s: mutex handle %p owned by %d:%ld", __func__,
+ handle, _wapi_getpid (), pthread_self ());
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);
-#endif
+ DEBUG ("%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);
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;
+ }
+
+ DEBUG ("%s: Checking ownership of named mutex handle %p", __func__,
+ handle);
+
+ if (namedmutex_handle->recursion == 0) {
+ DEBUG ("%s: Named mutex handle %p not owned", __func__,
+ handle);
+ } else if (namedmutex_handle->pid == _wapi_getpid ()) {
+ DEBUG ("%s: Named mutex handle %p owned by this process",
+ __func__, handle);
+ } else {
+ int thr_ret;
+ gpointer proc_handle;
+
+ DEBUG ("%s: Named mutex handle %p owned by another process", __func__, handle);
+ proc_handle = OpenProcess (0, 0, namedmutex_handle->pid);
+ if (proc_handle == NULL) {
+ /* Didn't find the process that this handle
+ * was owned by, overriding it
+ */
+ DEBUG ("%s: overriding old owner of named mutex handle %p", __func__, handle);
+ thr_ret = _wapi_handle_lock_shared_handles ();
+ g_assert (thr_ret == 0);
+
+ 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 ();
+ } else {
+ DEBUG ("%s: Found active pid %d for named mutex handle %p", __func__, namedmutex_handle->pid, handle);
+ }
+ if (proc_handle != NULL)
+ CloseProcess (proc_handle);
+ }
+}
+
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) {
-#ifdef DEBUG
- g_message ("%s: Mutex handle %p abandoned!", __func__, handle);
-#endif
+ pthread_equal (mutex_handle->tid, tid)) {
+ DEBUG ("%s: Mutex handle %p abandoned!", __func__, handle);
mutex_handle->recursion = 0;
mutex_handle->pid = 0;
g_assert (thr_ret == 0);
if (mutex_handle->pid == pid &&
- mutex_handle->tid == tid) {
-#ifdef DEBUG
- g_message ("%s: Mutex handle %p abandoned!", __func__, handle);
-#endif
+ pthread_equal (mutex_handle->tid, tid)) {
+ DEBUG ("%s: Mutex handle %p abandoned!", __func__, handle);
mutex_handle->recursion = 0;
mutex_handle->pid = 0;
*/
SetLastError (ERROR_SUCCESS);
-#ifdef DEBUG
- g_message ("%s: Creating unnamed mutex", __func__);
-#endif
+ DEBUG ("%s: Creating unnamed mutex", __func__);
handle = _wapi_handle_new (WAPI_HANDLE_MUTEX, &mutex_handle);
if (handle == _WAPI_HANDLE_INVALID) {
_wapi_handle_set_signal_state (handle, TRUE, FALSE);
}
-#ifdef DEBUG
- g_message ("%s: returning mutex handle %p", __func__, handle);
-#endif
+ DEBUG ("%s: returning mutex handle %p", __func__, handle);
thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
utf8_name = g_utf16_to_utf8 (name, -1, NULL, NULL, NULL);
-#ifdef DEBUG
- g_message ("%s: Creating named mutex [%s]", __func__, utf8_name);
-#endif
+ DEBUG ("%s: Creating named mutex [%s]", __func__, utf8_name);
offset = _wapi_search_handle_namespace (WAPI_HANDLE_NAMEDMUTEX,
utf8_name);
_wapi_handle_unlock_shared_handles ();
}
-#ifdef DEBUG
- g_message ("%s: returning mutex handle %p", __func__, handle);
-#endif
+ DEBUG ("%s: returning mutex handle %p", __func__, handle);
cleanup:
g_free (utf8_name);
{
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;
thr_ret = _wapi_handle_lock_handle (handle);
g_assert (thr_ret == 0);
-#ifdef DEBUG
- g_message("%s: Releasing mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%s: Releasing mutex handle %p", __func__, handle);
- if(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);
-#endif
+ if (!pthread_equal (mutex_handle->tid, tid) ||
+ mutex_handle->pid != pid) {
+ DEBUG("%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);
goto cleanup;
}
if(mutex_handle->recursion==0) {
_wapi_thread_disown_mutex (handle);
-#ifdef DEBUG
- g_message("%s: Unlocking mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%s: Unlocking mutex handle %p", __func__, handle);
mutex_handle->pid=0;
mutex_handle->tid=0;
{
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;
thr_ret = _wapi_handle_lock_shared_handles ();
g_assert (thr_ret == 0);
-#ifdef DEBUG
- g_message("%s: Releasing mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%s: Releasing mutex handle %p", __func__, handle);
- if(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);
-#endif
+ if (!pthread_equal (mutex_handle->tid, tid) ||
+ mutex_handle->pid != pid) {
+ DEBUG("%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);
goto cleanup;
}
if(mutex_handle->recursion==0) {
_wapi_thread_disown_mutex (handle);
-#ifdef DEBUG
- g_message("%s: Unlocking mutex handle %p", __func__, handle);
-#endif
+ DEBUG("%s: Unlocking mutex handle %p", __func__, handle);
mutex_handle->pid=0;
mutex_handle->tid=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
+ DEBUG ("%s: Opening named mutex [%s]", __func__, utf8_name);
offset = _wapi_search_handle_namespace (WAPI_HANDLE_NAMEDMUTEX,
utf8_name);
}
ret = handle;
-#ifdef DEBUG
- g_message ("%s: returning named mutex handle %p", __func__, handle);
-#endif
+ DEBUG ("%s: returning named mutex handle %p", __func__, handle);
cleanup:
g_free (utf8_name);
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