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src/util/u_atomic.c

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+/*
+ * Copyright © 2017 Gražvydas Ignotas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#if defined(MISSING_64BIT_ATOMICS) && defined(HAVE_PTHREAD)
+
+#include <stdint.h>
+#include <pthread.h>
+
+#if defined(HAVE_FUNC_ATTRIBUTE_WEAK) && !defined(__CYGWIN__)
+#define WEAK __attribute__((weak))
+#else
+#define WEAK
+#endif
+
+static pthread_mutex_t sync_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wmissing-prototypes"
+#pragma redefine_extname __sync_add_and_fetch_8_c __sync_add_and_fetch_8
+#pragma redefine_extname __sync_sub_and_fetch_8_c __sync_sub_and_fetch_8
+#pragma redefine_extname __sync_fetch_and_add_8_c __sync_fetch_and_add_8
+#pragma redefine_extname __sync_fetch_and_sub_8_c __sync_fetch_and_sub_8
+#pragma redefine_extname __sync_val_compare_and_swap_8_c \
+    __sync_val_compare_and_swap_8
+#define __sync_add_and_fetch_8 __sync_add_and_fetch_8_c
+#define __sync_sub_and_fetch_8 __sync_sub_and_fetch_8_c
+#define __sync_fetch_and_add_8 __sync_fetch_and_add_8_c
+#define __sync_fetch_and_sub_8 __sync_fetch_and_sub_8_c
+#define __sync_val_compare_and_swap_8 __sync_val_compare_and_swap_8_c
+#endif
+
+WEAK uint64_t
+__sync_add_and_fetch_8(uint64_t *ptr, uint64_t val)
+{
+   uint64_t r;
+
+   pthread_mutex_lock(&sync_mutex);
+   *ptr += val;
+   r = *ptr;
+   pthread_mutex_unlock(&sync_mutex);
+
+   return r;
+}
+
+WEAK uint64_t
+__sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
+{
+   uint64_t r;
+
+   pthread_mutex_lock(&sync_mutex);
+   *ptr -= val;
+   r = *ptr;
+   pthread_mutex_unlock(&sync_mutex);
+
+   return r;
+}
+
+WEAK uint64_t
+__sync_fetch_and_add_8(uint64_t *ptr, uint64_t val)
+{
+   uint64_t r;
+
+   pthread_mutex_lock(&sync_mutex);
+   r = *ptr;
+   *ptr += val;
+   pthread_mutex_unlock(&sync_mutex);
+
+   return r;
+}
+
+WEAK uint64_t
+__sync_fetch_and_sub_8(uint64_t *ptr, uint64_t val)
+{
+   uint64_t r;
+
+   pthread_mutex_lock(&sync_mutex);
+   r = *ptr;
+   *ptr -= val;
+   pthread_mutex_unlock(&sync_mutex);
+
+   return r;
+}
+
+WEAK uint64_t
+__sync_val_compare_and_swap_8(uint64_t *ptr, uint64_t oldval, uint64_t newval)
+{
+   uint64_t r;
+
+   pthread_mutex_lock(&sync_mutex);
+   r = *ptr;
+   if (*ptr == oldval)
+      *ptr = newval;
+   pthread_mutex_unlock(&sync_mutex);
+
+   return r;
+}
+
+#endif