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win32 threads: assume TryEnterCriticalSection

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Remove the dynamic lookup for TryEnterCriticalSection, which has existed
since Windows 2000.
This commit is contained in:
Ryan Lortie 2011-08-31 17:18:43 -04:00
parent 7cf89847e2
commit fc6a9275a4
1 changed files with 7 additions and 83 deletions
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90
gthread/gthread-win32.c
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@ -61,8 +61,6 @@ static CRITICAL_SECTION g_thread_global_spinlock;
typedef BOOL (__stdcall *GTryEnterCriticalSectionFunc) (CRITICAL_SECTION *);
static GTryEnterCriticalSectionFunc try_enter_critical_section = NULL;
/* As noted in the docs, GPrivate is a limited resource, here we take
* a rather low maximum to save memory, use GStaticPrivate instead. */
#define G_PRIVATE_MAX 100
@ -90,7 +88,7 @@ struct _GCond
};
static GMutex *
g_mutex_new_win32_cs_impl (void)
g_mutex_new_win32_impl (void)
{
CRITICAL_SECTION *cs = g_new (CRITICAL_SECTION, 1);
gpointer *retval = g_new (gpointer, 1);
@ -101,7 +99,7 @@ g_mutex_new_win32_cs_impl (void)
}
static void
g_mutex_free_win32_cs_impl (GMutex *mutex)
g_mutex_free_win32_impl (GMutex *mutex)
{
gpointer *ptr = (gpointer *) mutex;
CRITICAL_SECTION *cs = (CRITICAL_SECTION *) *ptr;
@ -115,63 +113,21 @@ g_mutex_free_win32_cs_impl (GMutex *mutex)
functions from gmem.c and gmessages.c; */
static void
g_mutex_lock_win32_cs_impl (GMutex *mutex)
g_mutex_lock_win32_impl (GMutex *mutex)
{
EnterCriticalSection (*(CRITICAL_SECTION **)mutex);
}
static gboolean
g_mutex_trylock_win32_cs_impl (GMutex * mutex)
{
return try_enter_critical_section (*(CRITICAL_SECTION **)mutex);
}
static void
g_mutex_unlock_win32_cs_impl (GMutex *mutex)
{
LeaveCriticalSection (*(CRITICAL_SECTION **)mutex);
}
static GMutex *
g_mutex_new_win32_impl (void)
{
HANDLE handle;
HANDLE *retval;
win32_check_for_error (handle = CreateMutex (NULL, FALSE, NULL));
retval = g_new (HANDLE, 1);
*retval = handle;
return (GMutex *) retval;
}
static void
g_mutex_free_win32_impl (GMutex *mutex)
{
win32_check_for_error (CloseHandle (*(HANDLE *) mutex));
g_free (mutex);
}
/* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
functions from gmem.c and gmessages.c; */
static void
g_mutex_lock_win32_impl (GMutex *mutex)
{
WaitForSingleObject (*(HANDLE *) mutex, INFINITE);
}
static gboolean
g_mutex_trylock_win32_impl (GMutex * mutex)
{
DWORD result;
win32_check_for_error (WAIT_FAILED !=
(result = WaitForSingleObject (*(HANDLE *)mutex, 0)));
return result != WAIT_TIMEOUT;
return TryEnterCriticalSection (*(CRITICAL_SECTION **)mutex);
}
static void
g_mutex_unlock_win32_impl (GMutex *mutex)
{
ReleaseMutex (*(HANDLE *) mutex);
LeaveCriticalSection (*(CRITICAL_SECTION **)mutex);
}
static GCond *
@ -234,12 +190,12 @@ g_cond_wait_internal (GCond *cond,
g_ptr_array_add (cond->array, event);
LeaveCriticalSection (&cond->lock);
g_thread_functions_for_glib_use_default.mutex_unlock (entered_mutex);
g_mutex_unlock (entered_mutex);
win32_check_for_error (WAIT_FAILED !=
(retval = WaitForSingleObject (event, milliseconds)));
g_thread_functions_for_glib_use_default.mutex_lock (entered_mutex);
g_mutex_lock (entered_mutex);
if (retval == WAIT_TIMEOUT)
{
@ -588,7 +544,6 @@ static void
g_thread_impl_init ()
{
static gboolean beenhere = FALSE;
HMODULE kernel32;
if (beenhere)
return;
@ -602,35 +557,4 @@ g_thread_impl_init ()
win32_check_for_error (TLS_OUT_OF_INDEXES !=
(g_cond_event_tls = TlsAlloc ()));
InitializeCriticalSection (&g_thread_global_spinlock);
/* Here we are looking for TryEnterCriticalSection in KERNEL32.DLL,
* if it is found, we can use the in general faster critical
* sections instead of mutexes. See
* http://world.std.com/~jmhart/csmutx.htm for some discussion.
*/
kernel32 = GetModuleHandle ("KERNEL32.DLL");
if (kernel32)
{
try_enter_critical_section = (GTryEnterCriticalSectionFunc)
GetProcAddress(kernel32, "TryEnterCriticalSection");
/* Even if TryEnterCriticalSection is found, it is not
* necessarily working..., we have to check it */
if (try_enter_critical_section &&
try_enter_critical_section (&g_thread_global_spinlock))
{
LeaveCriticalSection (&g_thread_global_spinlock);
g_thread_functions_for_glib_use_default.mutex_new =
g_mutex_new_win32_cs_impl;
g_thread_functions_for_glib_use_default.mutex_lock =
g_mutex_lock_win32_cs_impl;
g_thread_functions_for_glib_use_default.mutex_trylock =
g_mutex_trylock_win32_cs_impl;
g_thread_functions_for_glib_use_default.mutex_unlock =
g_mutex_unlock_win32_cs_impl;
g_thread_functions_for_glib_use_default.mutex_free =
g_mutex_free_win32_cs_impl;
}
}
}