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synced 2024-11-10 19:36:18 +01:00
gatomic: use pthread mutexes instead of GMutex
GStaticMutex makes use of atomic operations to initialise itself. We were using GStaticMutex from the emulated case of gatomic. Use pthreads directly to avoid unbounded recursion in this case.
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@ -82,6 +82,17 @@
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* perform the operations normally and then release the lock.
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**/
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/* NOTE CAREFULLY:
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*
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* This file is the lowest-level part of GLib.
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*
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* Other lowlevel parts of GLib (threads, slice allocator, g_malloc,
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* messages, etc) call into these functions and macros to get work done.
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*
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* As such, these functions can not call back into any part of GLib
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* without risking recursion.
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*/
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#ifdef G_ATOMIC_OP_USE_GCC_BUILTINS
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#ifndef __GNUC__
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@ -604,18 +615,24 @@ gsize
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#else
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#include "gthread.h"
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/* We are not permitted to call into any GLib functions from here, so we
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* can not use GMutex.
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*
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* Fortunately, we already take care of the Windows case above, and all
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* non-Windows platforms on which glib runs have pthreads. Use those.
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*/
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#include <pthread.h>
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static GStaticMutex g_atomic_lock;
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static pthread_mutex_t g_atomic_lock = PTHREAD_MUTEX_INITIALIZER;
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gint
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(g_atomic_int_get) (volatile gint *atomic)
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{
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gint value;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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value = *atomic;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return value;
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}
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@ -624,17 +641,17 @@ void
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(g_atomic_int_set) (volatile gint *atomic,
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gint value)
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{
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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*atomic = value;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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}
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void
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(g_atomic_int_inc) (volatile gint *atomic)
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{
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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(*atomic)++;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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}
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gboolean
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@ -642,9 +659,9 @@ gboolean
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{
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gboolean is_zero;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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is_zero = --(*atomic) == 0;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return is_zero;
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}
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@ -656,12 +673,12 @@ gboolean
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{
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gboolean success;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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if ((success = (*atomic == oldval)))
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*atomic = newval;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return success;
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}
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@ -672,10 +689,10 @@ gint
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{
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gint oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *atomic;
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*atomic = oldval + val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -686,10 +703,10 @@ guint
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{
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guint oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *atomic;
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*atomic = oldval & val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -700,10 +717,10 @@ guint
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{
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guint oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *atomic;
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*atomic = oldval | val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -714,10 +731,10 @@ guint
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{
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guint oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *atomic;
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*atomic = oldval ^ val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -729,9 +746,9 @@ gpointer
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volatile gpointer *ptr = atomic;
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gpointer value;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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value = *ptr;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return value;
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}
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@ -742,9 +759,9 @@ void
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{
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volatile gpointer *ptr = atomic;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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*ptr = newval;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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}
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gboolean
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@ -755,12 +772,12 @@ gboolean
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volatile gpointer *ptr = atomic;
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gboolean success;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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if ((success = (*ptr == oldval)))
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*ptr = newval;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return success;
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}
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@ -772,10 +789,10 @@ gssize
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volatile gssize *ptr = atomic;
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gssize oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *ptr;
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*ptr = oldval + val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -787,10 +804,10 @@ gsize
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volatile gsize *ptr = atomic;
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gsize oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *ptr;
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*ptr = oldval & val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -802,10 +819,10 @@ gsize
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volatile gsize *ptr = atomic;
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gsize oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *ptr;
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*ptr = oldval | val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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@ -817,10 +834,10 @@ gsize
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volatile gsize *ptr = atomic;
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gsize oldval;
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g_static_mutex_lock (&g_atomic_lock);
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pthread_mutex_lock (&g_atomic_lock);
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oldval = *ptr;
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*ptr = oldval ^ val;
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g_static_mutex_unlock (&g_atomic_lock);
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pthread_mutex_unlock (&g_atomic_lock);
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return oldval;
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}
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