#include <mono/io-layer/wapi.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/semaphore-private.h>
+#include <mono/utils/mono-once.h>
-#undef DEBUG
+#if 0
+#define DEBUG(...) g_message(__VA_ARGS__)
+#else
+#define DEBUG(...)
+#endif
static void sema_signal(gpointer handle);
static gboolean sema_own (gpointer handle);
+static void namedsema_signal (gpointer handle);
+static gboolean namedsema_own (gpointer handle);
+
struct _WapiHandleOps _wapi_sem_ops = {
NULL, /* close */
sema_signal, /* signal */
sema_own, /* own */
NULL, /* is_owned */
+ NULL, /* special_wait */
+ NULL /* prewait */
};
void _wapi_sem_details (gpointer handle_info)
g_print ("val: %5u, max: %5d", sem->val, sem->max);
}
+struct _WapiHandleOps _wapi_namedsem_ops = {
+ NULL, /* close */
+ namedsema_signal, /* signal */
+ namedsema_own, /* own */
+ NULL, /* is_owned */
+ NULL, /* special_wait */
+ NULL /* prewait */
+};
+
+static gboolean sem_release (gpointer handle, gint32 count, gint32 *prev);
+static gboolean namedsem_release (gpointer handle, gint32 count, gint32 *prev);
+
+static struct
+{
+ gboolean (*release)(gpointer handle, gint32 count, gint32 *prev);
+} sem_ops[WAPI_HANDLE_COUNT] = {
+ {NULL},
+ {NULL},
+ {NULL},
+ {NULL},
+ {sem_release},
+ {NULL},
+ {NULL},
+ {NULL},
+ {NULL},
+ {NULL},
+ {NULL},
+ {NULL},
+ {namedsem_release},
+};
+
static mono_once_t sem_ops_once=MONO_ONCE_INIT;
static void sem_ops_init (void)
{
_wapi_handle_register_capabilities (WAPI_HANDLE_SEM,
- WAPI_HANDLE_CAP_WAIT |
- WAPI_HANDLE_CAP_SIGNAL);
+ (WapiHandleCapability)(WAPI_HANDLE_CAP_WAIT | WAPI_HANDLE_CAP_SIGNAL));
+ _wapi_handle_register_capabilities (WAPI_HANDLE_NAMEDSEM,
+ (WapiHandleCapability)(WAPI_HANDLE_CAP_WAIT | WAPI_HANDLE_CAP_SIGNAL));
}
static void sema_signal(gpointer handle)
return(FALSE);
}
-#ifdef DEBUG
- g_message("%s: owning sem handle %p", __func__, handle);
-#endif
+ DEBUG("%s: owning sem handle %p", __func__, handle);
sem_handle->val--;
-#ifdef DEBUG
- g_message ("%s: sem %p val now %d", __func__, handle, sem_handle->val);
-#endif
+ DEBUG ("%s: sem %p val now %d", __func__, handle, sem_handle->val);
if(sem_handle->val==0) {
_wapi_handle_set_signal_state (handle, FALSE, FALSE);
return(TRUE);
}
+static void namedsema_signal (gpointer handle)
+{
+ ReleaseSemaphore (handle, 1, NULL);
+}
+
+/* NB, always called with the shared handle lock held */
+static gboolean namedsema_own (gpointer handle)
+{
+ struct _WapiHandle_namedsem *namedsem_handle;
+ gboolean ok;
+
+ DEBUG ("%s: owning named sem handle %p", __func__, handle);
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_NAMEDSEM,
+ (gpointer *)&namedsem_handle);
+ if (ok == FALSE) {
+ g_warning ("%s: error looking up named sem handle %p",
+ __func__, handle);
+ return (FALSE);
+ }
+
+ namedsem_handle->val--;
+
+ DEBUG ("%s: named sem %p val now %d", __func__, handle,
+ namedsem_handle->val);
+
+ if (namedsem_handle->val == 0) {
+ _wapi_shared_handle_set_signal_state (handle, FALSE);
+ }
+
+ return (TRUE);
+}
+static gpointer sem_create (WapiSecurityAttributes *security G_GNUC_UNUSED,
+ gint32 initial, gint32 max)
+{
+ struct _WapiHandle_sem sem_handle = {0};
+ gpointer handle;
+ int thr_ret;
+
+ /* Need to blow away any old errors here, because code tests
+ * for ERROR_ALREADY_EXISTS on success (!) to see if a
+ * semaphore was freshly created
+ */
+ SetLastError (ERROR_SUCCESS);
+
+ sem_handle.val = initial;
+ sem_handle.max = max;
+
+ handle = _wapi_handle_new (WAPI_HANDLE_SEM, &sem_handle);
+ if (handle == _WAPI_HANDLE_INVALID) {
+ g_warning ("%s: error creating semaphore handle", __func__);
+ SetLastError (ERROR_GEN_FAILURE);
+ return(NULL);
+ }
+
+ thr_ret = _wapi_handle_lock_handle (handle);
+ g_assert (thr_ret == 0);
+
+ if (initial != 0) {
+ _wapi_handle_set_signal_state (handle, TRUE, FALSE);
+ }
+
+ DEBUG ("%s: Created semaphore handle %p initial %d max %d",
+ __func__, handle, initial, max);
+
+ thr_ret = _wapi_handle_unlock_handle (handle);
+ g_assert (thr_ret == 0);
+
+ return(handle);
+}
+
+static gpointer namedsem_create (WapiSecurityAttributes *security G_GNUC_UNUSED, gint32 initial, gint32 max, const gunichar2 *name G_GNUC_UNUSED)
+{
+ struct _WapiHandle_namedsem namedsem_handle = {{{0}}, 0};
+ gpointer handle;
+ gchar *utf8_name;
+ int thr_ret;
+ gpointer ret = NULL;
+ guint32 namelen;
+ gint32 offset;
+
+ /* w32 seems to guarantee that opening named objects can't
+ * race each other
+ */
+ thr_ret = _wapi_namespace_lock ();
+ g_assert (thr_ret == 0);
+
+ /* Need to blow away any old errors here, because code tests
+ * for ERROR_ALREADY_EXISTS on success (!) to see if a
+ * semaphore was freshly created
+ */
+ SetLastError (ERROR_SUCCESS);
+
+ utf8_name = g_utf16_to_utf8 (name, -1, NULL, NULL, NULL);
+
+ DEBUG ("%s: Creating named sem [%s]", __func__, utf8_name);
+
+ offset = _wapi_search_handle_namespace (WAPI_HANDLE_NAMEDSEM,
+ 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) {
+ /* Not an error, but this is how the caller is
+ * informed that the semaphore wasn't freshly created
+ */
+ SetLastError (ERROR_ALREADY_EXISTS);
+ }
+ /* Fall through to create the semaphore handle */
+
+ if (offset == 0) {
+ /* A new named semaphore, so create both the private
+ * and shared parts
+ */
+ if (strlen (utf8_name) < MAX_PATH) {
+ namelen = strlen (utf8_name);
+ } else {
+ namelen = MAX_PATH;
+ }
+
+ memcpy (&namedsem_handle.sharedns.name, utf8_name, namelen);
+
+ namedsem_handle.val = initial;
+ namedsem_handle.max = max;
+
+ handle = _wapi_handle_new (WAPI_HANDLE_NAMEDSEM,
+ &namedsem_handle);
+ } else {
+ /* A new reference to an existing named semaphore, so
+ * just create the private part
+ */
+ handle = _wapi_handle_new_from_offset (WAPI_HANDLE_NAMEDSEM,
+ offset, TRUE);
+ }
+
+ if (handle == _WAPI_HANDLE_INVALID) {
+ g_warning ("%s: error creating named sem handle", __func__);
+ SetLastError (ERROR_GEN_FAILURE);
+ goto cleanup;
+ }
+ ret = handle;
+
+ if (offset == 0) {
+ /* Set the initial state, as this is a completely new
+ * handle
+ */
+ thr_ret = _wapi_handle_lock_shared_handles ();
+ g_assert (thr_ret == 0);
+
+ if (initial != 0) {
+ _wapi_shared_handle_set_signal_state (handle, TRUE);
+ }
+
+ _wapi_handle_unlock_shared_handles ();
+ }
+
+ DEBUG ("%s: returning named sem handle %p", __func__, handle);
+
+cleanup:
+ g_free (utf8_name);
+
+ _wapi_namespace_unlock (NULL);
+
+ return (ret);
+}
+
/**
* CreateSemaphore:
*
* Return value: a new handle, or NULL
*/
-gpointer CreateSemaphore(WapiSecurityAttributes *security G_GNUC_UNUSED, gint32 initial, gint32 max, const gunichar2 *name G_GNUC_UNUSED)
+gpointer CreateSemaphore(WapiSecurityAttributes *security G_GNUC_UNUSED, gint32 initial, gint32 max, const gunichar2 *name)
{
- struct _WapiHandle_sem sem_handle = {0};
- gpointer handle;
- int thr_ret;
-
mono_once (&sem_ops_once, sem_ops_init);
- if(max<=0) {
-#ifdef DEBUG
- g_message("%s: max <= 0", __func__);
-#endif
+ if (max <= 0) {
+ DEBUG ("%s: max <= 0", __func__);
SetLastError (ERROR_INVALID_PARAMETER);
return(NULL);
}
- if(initial>max || initial<0) {
-#ifdef DEBUG
- g_message("%s: initial>max or < 0", __func__);
-#endif
+ if (initial > max || initial < 0) {
+ DEBUG ("%s: initial>max or < 0", __func__);
SetLastError (ERROR_INVALID_PARAMETER);
return(NULL);
}
-
- sem_handle.val = initial;
- sem_handle.max = max;
- handle = _wapi_handle_new (WAPI_HANDLE_SEM, &sem_handle);
- if (handle == _WAPI_HANDLE_INVALID) {
- g_warning ("%s: error creating semaphore handle", __func__);
- SetLastError (ERROR_GEN_FAILURE);
- return(NULL);
+ if (name == NULL) {
+ return (sem_create (security, initial, max));
+ } else {
+ return (namedsem_create (security, initial, max, name));
+ }
+}
+
+static gboolean sem_release (gpointer handle, gint32 count, gint32 *prevcount)
+{
+ struct _WapiHandle_sem *sem_handle;
+ gboolean ok;
+ gboolean ret=FALSE;
+ int thr_ret;
+
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_SEM,
+ (gpointer *)&sem_handle);
+ if (ok == FALSE) {
+ g_warning ("%s: error looking up sem handle %p", __func__,
+ handle);
+ return(FALSE);
}
- pthread_cleanup_push ((void(*)(void *))_wapi_handle_unlock_handle,
- handle);
thr_ret = _wapi_handle_lock_handle (handle);
g_assert (thr_ret == 0);
+
+ DEBUG ("%s: sem %p val %d count %d", __func__, handle,
+ sem_handle->val, count);
- if (initial != 0) {
- _wapi_handle_set_signal_state (handle, TRUE, FALSE);
+ /* Do this before checking for count overflow, because overflowing max
+ * is a listed technique for finding the current value
+ */
+ if (prevcount != NULL) {
+ *prevcount = sem_handle->val;
}
+
+ /* No idea why max is signed, but thats the spec :-( */
+ if (sem_handle->val + count > (guint32)sem_handle->max) {
+ DEBUG ("%s: sem %p max value would be exceeded: max %d current %d count %d", __func__, handle, sem_handle->max, sem_handle->val, count);
-#ifdef DEBUG
- g_message ("%s: Created semaphore handle %p initial %d max %d",
- __func__, handle, initial, max);
-#endif
+ goto end;
+ }
+
+ sem_handle->val += count;
+ _wapi_handle_set_signal_state (handle, TRUE, TRUE);
+
+ ret = TRUE;
+ DEBUG ("%s: sem %p val now %d", __func__, handle, sem_handle->val);
+
+end:
thr_ret = _wapi_handle_unlock_handle (handle);
g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
- return(handle);
+ return(ret);
}
-/**
- * ReleaseSemaphore:
- * @handle: The semaphore handle to release.
- * @count: The amount by which the semaphore's count should be
- * increased.
- * @prevcount: Pointer to a location to store the previous count of
- * the semaphore, or %NULL.
- *
- * Increases the count of semaphore @handle by @count.
- *
- * Return value: %TRUE on success, %FALSE otherwise.
- */
-gboolean ReleaseSemaphore(gpointer handle, gint32 count, gint32 *prevcount)
+static gboolean namedsem_release (gpointer handle, gint32 count,
+ gint32 *prevcount)
{
- struct _WapiHandle_sem *sem_handle;
+ struct _WapiHandle_namedsem *sem_handle;
gboolean ok;
gboolean ret=FALSE;
int thr_ret;
- ok=_wapi_lookup_handle (handle, WAPI_HANDLE_SEM,
- (gpointer *)&sem_handle);
- if(ok==FALSE) {
+ ok = _wapi_lookup_handle (handle, WAPI_HANDLE_NAMEDSEM,
+ (gpointer *)&sem_handle);
+ if (ok == FALSE) {
g_warning ("%s: error looking up sem handle %p", __func__,
handle);
return(FALSE);
}
- pthread_cleanup_push ((void(*)(void *))_wapi_handle_unlock_handle,
- handle);
- thr_ret = _wapi_handle_lock_handle (handle);
+ thr_ret = _wapi_handle_lock_shared_handles ();
g_assert (thr_ret == 0);
-#ifdef DEBUG
- g_message("%s: sem %p val %d count %d", __func__, handle,
+ DEBUG("%s: named sem %p val %d count %d", __func__, handle,
sem_handle->val, count);
-#endif
/* Do this before checking for count overflow, because overflowing max
* is a listed technique for finding the current value
*/
- if(prevcount!=NULL) {
- *prevcount=sem_handle->val;
+ if (prevcount != NULL) {
+ *prevcount = sem_handle->val;
}
/* No idea why max is signed, but thats the spec :-( */
- if(sem_handle->val+count > (guint32)sem_handle->max) {
-#ifdef DEBUG
- g_message("%s: sem %p max value would be exceeded: max %d current %d count %d", __func__, handle, sem_handle->max, sem_handle->val, count);
-#endif
+ if (sem_handle->val + count > (guint32)sem_handle->max) {
+ DEBUG ("%s: named sem %p max value would be exceeded: max %d current %d count %d", __func__, handle, sem_handle->max, sem_handle->val, count);
goto end;
}
- sem_handle->val+=count;
- _wapi_handle_set_signal_state (handle, TRUE, TRUE);
+ sem_handle->val += count;
+ _wapi_shared_handle_set_signal_state (handle, TRUE);
- ret=TRUE;
+ ret = TRUE;
-#ifdef DEBUG
- g_message("%s: sem %p val now %d", __func__, handle, sem_handle->val);
-#endif
+ DEBUG("%s: named sem %p val now %d", __func__, handle,
+ sem_handle->val);
end:
- thr_ret = _wapi_handle_unlock_handle (handle);
- g_assert (thr_ret == 0);
- pthread_cleanup_pop (0);
+ _wapi_handle_unlock_shared_handles ();
return(ret);
}
+
+/**
+ * ReleaseSemaphore:
+ * @handle: The semaphore handle to release.
+ * @count: The amount by which the semaphore's count should be
+ * increased.
+ * @prevcount: Pointer to a location to store the previous count of
+ * the semaphore, or %NULL.
+ *
+ * Increases the count of semaphore @handle by @count.
+ *
+ * Return value: %TRUE on success, %FALSE otherwise.
+ */
+gboolean ReleaseSemaphore(gpointer handle, gint32 count, gint32 *prevcount)
+{
+ WapiHandleType type;
+
+ if (handle == NULL) {
+ SetLastError (ERROR_INVALID_HANDLE);
+ return (FALSE);
+ }
+
+ type = _wapi_handle_type (handle);
+
+ if (sem_ops[type].release == NULL) {
+ SetLastError (ERROR_INVALID_HANDLE);
+ return (FALSE);
+ }
+
+ return (sem_ops[type].release (handle, count, prevcount));
+}
+
+gpointer OpenSemaphore (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 (&sem_ops_once, sem_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);
+
+ DEBUG ("%s: Opening named sem [%s]", __func__, utf8_name);
+
+ offset = _wapi_search_handle_namespace (WAPI_HANDLE_NAMEDSEM,
+ 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 semaphore, so just
+ * create the private part
+ */
+ handle = _wapi_handle_new_from_offset (WAPI_HANDLE_NAMEDSEM, offset,
+ TRUE);
+
+ if (handle == _WAPI_HANDLE_INVALID) {
+ g_warning ("%s: error opening named sem handle", __func__);
+ SetLastError (ERROR_GEN_FAILURE);
+ goto cleanup;
+ }
+ ret = handle;
+
+ DEBUG ("%s: returning named sem handle %p", __func__, handle);
+
+cleanup:
+ g_free (utf8_name);
+
+ _wapi_namespace_unlock (NULL);
+
+ return (ret);
+}
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