+/*
+ * Copyright (c) 2003 by Hewlett-Packard Company. All rights reserved.
+ *
+ * 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 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.
+ */
+
+/* The following is useful primarily for debugging and documentation. */
+/* We define various atomic operations by acquiring a global pthread */
+/* lock. The resulting implementation will perform poorly, but should */
+/* be correct unless it is used from signal handlers. */
+/* We assume that all pthread operations act like full memory barriers. */
+/* (We believe that is the intent of the specification.) */
+
+#include <pthread.h>
+
+#include "test_and_set_t_is_ao_t.h"
+ /* This is not necessarily compatible with the native */
+ /* implementation. But those can't be safely mixed anyway. */
+
+/* We define only the full barrier variants, and count on the */
+/* generalization section below to fill in the rest. */
+extern pthread_mutex_t AO_pt_lock;
+
+AO_INLINE void
+AO_nop_full(void)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_nop_full
+
+AO_INLINE AO_t
+AO_load_full(const volatile AO_t *addr)
+{
+ AO_t result;
+ pthread_mutex_lock(&AO_pt_lock);
+ result = *addr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return result;
+}
+#define AO_HAVE_load_full
+
+AO_INLINE void
+AO_store_full(volatile AO_t *addr, AO_t val)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ *addr = val;
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_store_full
+
+AO_INLINE unsigned char
+AO_char_load_full(const volatile unsigned char *addr)
+{
+ unsigned char result;
+ pthread_mutex_lock(&AO_pt_lock);
+ result = *addr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return result;
+}
+#define AO_HAVE_char_load_full
+
+AO_INLINE void
+AO_char_store_full(volatile unsigned char *addr, unsigned char val)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ *addr = val;
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_char_store_full
+
+AO_INLINE unsigned short
+AO_short_load_full(const volatile unsigned short *addr)
+{
+ unsigned short result;
+ pthread_mutex_lock(&AO_pt_lock);
+ result = *addr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return result;
+}
+#define AO_HAVE_short_load_full
+
+AO_INLINE void
+AO_short_store_full(volatile unsigned short *addr, unsigned short val)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ *addr = val;
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_short_store_full
+
+AO_INLINE unsigned int
+AO_int_load_full(const volatile unsigned int *addr)
+{
+ unsigned int result;
+ pthread_mutex_lock(&AO_pt_lock);
+ result = *addr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return result;
+}
+#define AO_HAVE_int_load_full
+
+AO_INLINE void
+AO_int_store_full(volatile unsigned int *addr, unsigned int val)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ *addr = val;
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_int_store_full
+
+AO_INLINE AO_TS_VAL_t
+AO_test_and_set_full(volatile AO_TS_t *addr)
+{
+ AO_TS_VAL_t result;
+ pthread_mutex_lock(&AO_pt_lock);
+ result = (AO_TS_VAL_t)(*addr);
+ *addr = AO_TS_SET;
+ pthread_mutex_unlock(&AO_pt_lock);
+ assert(result == AO_TS_SET || result == AO_TS_CLEAR);
+ return result;
+}
+#define AO_HAVE_test_and_set_full
+
+AO_INLINE AO_t
+AO_fetch_and_add_full(volatile AO_t *p, AO_t incr)
+{
+ AO_t tmp;
+
+ pthread_mutex_lock(&AO_pt_lock);
+ tmp = *p;
+ *p = tmp + incr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return tmp;
+}
+#define AO_HAVE_fetch_and_add_full
+
+AO_INLINE unsigned char
+AO_char_fetch_and_add_full(volatile unsigned char *p, unsigned char incr)
+{
+ unsigned char tmp;
+
+ pthread_mutex_lock(&AO_pt_lock);
+ tmp = *p;
+ *p = tmp + incr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return tmp;
+}
+#define AO_HAVE_char_fetch_and_add_full
+
+AO_INLINE unsigned short
+AO_short_fetch_and_add_full(volatile unsigned short *p, unsigned short incr)
+{
+ unsigned short tmp;
+
+ pthread_mutex_lock(&AO_pt_lock);
+ tmp = *p;
+ *p = tmp + incr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return tmp;
+}
+#define AO_HAVE_short_fetch_and_add_full
+
+AO_INLINE unsigned int
+AO_int_fetch_and_add_full(volatile unsigned int *p, unsigned int incr)
+{
+ unsigned int tmp;
+
+ pthread_mutex_lock(&AO_pt_lock);
+ tmp = *p;
+ *p = tmp + incr;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return tmp;
+}
+#define AO_HAVE_int_fetch_and_add_full
+
+AO_INLINE void
+AO_or_full(volatile AO_t *p, AO_t incr)
+{
+ AO_t tmp;
+
+ pthread_mutex_lock(&AO_pt_lock);
+ tmp = *p;
+ *p = (tmp | incr);
+ pthread_mutex_unlock(&AO_pt_lock);
+}
+#define AO_HAVE_or_full
+
+AO_INLINE int
+AO_compare_and_swap_full(volatile AO_t *addr,
+ AO_t old, AO_t new_val)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ if (*addr == old)
+ {
+ *addr = new_val;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 1;
+ }
+ else
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 0;
+}
+#define AO_HAVE_compare_and_swap_full
+
+/* Unlike real architectures, we define both double-width CAS variants. */
+
+typedef struct {
+ AO_t AO_val1;
+ AO_t AO_val2;
+} AO_double_t;
+#define AO_HAVE_double_t
+
+AO_INLINE int
+AO_compare_double_and_swap_double_full(volatile AO_double_t *addr,
+ AO_t old1, AO_t old2,
+ AO_t new1, AO_t new2)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ if (addr -> AO_val1 == old1 && addr -> AO_val2 == old2)
+ {
+ addr -> AO_val1 = new1;
+ addr -> AO_val2 = new2;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 1;
+ }
+ else
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 0;
+}
+#define AO_HAVE_compare_double_and_swap_double_full
+
+AO_INLINE int
+AO_compare_and_swap_double_full(volatile AO_double_t *addr,
+ AO_t old1,
+ AO_t new1, AO_t new2)
+{
+ pthread_mutex_lock(&AO_pt_lock);
+ if (addr -> AO_val1 == old1)
+ {
+ addr -> AO_val1 = new1;
+ addr -> AO_val2 = new2;
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 1;
+ }
+ else
+ pthread_mutex_unlock(&AO_pt_lock);
+ return 0;
+}
+#define AO_HAVE_compare_and_swap_double_full
+
+/* We can't use hardware loads and stores, since they don't */
+/* interact correctly with atomic updates. */
projects / hs-boehmgc.git / blobdiff