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authorThomas Hellstrom <thellstrom-at-vmware-dot-com>2009-03-16 11:40:18 +0100
committerThomas Hellstrom <thellstrom-at-vmware-dot-com>2009-03-16 11:40:18 +0100
commitfc1ef97c3349588cd33a22dc88ab30b6f701000e (patch)
treee2b62a08ebd28b8a99d678644ad8e6fe1df08f18 /src/gallium/include
parent1f3fe405547f2ad94d1c6140b0494297640dbe6e (diff)
gallium: Add simple atomic class api.
Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
Diffstat (limited to 'src/gallium/include')
-rw-r--r--src/gallium/include/pipe/p_atomic.h154
1 files changed, 154 insertions, 0 deletions
diff --git a/src/gallium/include/pipe/p_atomic.h b/src/gallium/include/pipe/p_atomic.h
new file mode 100644
index 0000000000..578d59480e
--- /dev/null
+++ b/src/gallium/include/pipe/p_atomic.h
@@ -0,0 +1,154 @@
+/**
+ * Many similar implementations exist. See for example libwsbm
+ * or the linux kernel include/atomic.h
+ *
+ * No copyright claimed on this file.
+ *
+ */
+
+#ifndef P_ATOMIC_H
+#define P_ATOMIC_H
+
+#include "p_defines.h"
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if (defined(PIPE_CC_GCC))
+struct pipe_atomic {
+ int32_t count;
+};
+
+#define p_atomic_set(_v, _i) ((_v)->count = (_i))
+#define p_atomic_read(_v) ((_v)->count)
+
+
+static INLINE boolean
+p_atomic_dec_zero(struct pipe_atomic *v)
+{
+#ifdef __i386__
+ unsigned char c;
+
+ __asm__ __volatile__("lock; decl %0; sete %1":"+m"(v->count), "=qm"(c)
+ ::"memory");
+
+ return c != 0;
+#else /* __i386__*/
+ return (__sync_sub_and_fetch(&v->count, 1) == 0);
+#endif /* __i386__*/
+}
+
+static INLINE void
+p_atomic_inc(struct pipe_atomic *v)
+{
+#ifdef __i386__
+ __asm__ __volatile__("lock; incl %0":"+m"(v->count));
+#else /* __i386__*/
+ (void) __sync_add_and_fetch(&v->count, 1);
+#endif /* __i386__*/
+}
+
+static INLINE void
+p_atomic_dec(struct pipe_atomic *v)
+{
+#ifdef __i386__
+ __asm__ __volatile__("lock; decl %0":"+m"(v->count));
+#else /* __i386__*/
+ (void) __sync_sub_and_fetch(&v->count, 1);
+#endif /* __i386__*/
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
+{
+ return __sync_val_compare_and_swap(&v->count, old, new);
+}
+
+#else /* (defined(PIPE_CC_GCC)) */
+
+#include "pipe/p_thread.h"
+
+/**
+ * This implementation should really not be used.
+ * Add an assembly port instead. It may abort and
+ * doesn't destroy used mutexes.
+ */
+
+struct pipe_atomic {
+ pipe_mutex mutex;
+ int32_t count;
+};
+
+static INLINE void
+p_atomic_set(struct pipe_atomic *v, int32_t i)
+{
+ int ret;
+ ret = pipe_mutex_init(v->mutex);
+ if (ret)
+ abort();
+ pipe_mutex_lock(v->mutex);
+ v->count = i;
+ pipe_mutex_unlock(v->mutex);
+}
+
+static INLINE int32_t
+p_atomic_read(struct pipe_atomic *v)
+{
+ int32_t ret;
+
+ pipe_mutex_lock(v->mutex);
+ ret = v->count;
+ pipe_mutex_unlock(v->mutex);
+ return ret;
+}
+
+static INLINE void
+p_atomic_inc(struct pipe_atomic *v)
+{
+ pipe_mutex_lock(v->mutex);
+ ++v->count;
+ pipe_mutex_unlock(v->mutex);
+}
+
+static INLINE void
+p_atomic_dec(struct pipe_atomic *v)
+{
+ pipe_mutex_lock(v->mutex);
+ --v->count;
+ pipe_mutex_unlock(v->mutex);
+}
+
+static INLINE boolean
+p_atomic_dec_zero(struct pipe_atomic *v)
+{
+ boolean ret;
+
+ pipe_mutex_lock(v->mutex);
+ ret = (--v->count == 0);
+ pipe_mutex_unlock(v->mutex);
+ return ret;
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
+{
+ int32_t ret;
+
+ pipe_mutex_lock(v->mutex);
+ ret = v->count;
+ if (ret == old)
+ v->count = new;
+ pipe_mutex_unlock(v->mutex);
+
+ return ret;
+}
+
+#endif /* (defined(PIPE_CC_GCC)) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* P_ATOMIC_H */