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| author | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
| commit | e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f (patch) | |
| tree | 1804d7456ba8f200c7e329d4e6aa67ce4fb1649f /mesalib/src/gallium/auxiliary/util/u_atomic.h | |
| parent | 88a78ebea08af461224f815a8380ea5c54186f43 (diff) | |
| parent | 0402d388cb9803652c0f9a52ba7dcb6029fdd0b9 (diff) | |
| download | vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.gz vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.bz2 vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.zip | |
svn merge ^/branches/released .
Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_atomic.h')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_atomic.h | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_atomic.h b/mesalib/src/gallium/auxiliary/util/u_atomic.h new file mode 100644 index 000000000..e8c0fdf75 --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_atomic.h @@ -0,0 +1,352 @@ +/**
+ * Many similar implementations exist. See for example libwsbm
+ * or the linux kernel include/atomic.h
+ *
+ * No copyright claimed on this file.
+ *
+ */
+
+#ifndef U_ATOMIC_H
+#define U_ATOMIC_H
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_defines.h"
+
+/* Favor OS-provided implementations.
+ *
+ * Where no OS-provided implementation is available, fall back to
+ * locally coded assembly, compiler intrinsic or ultimately a
+ * mutex-based implementation.
+ */
+#if (defined(PIPE_SUBSYSTEM_WINDOWS_DISPLAY) || \
+ defined(PIPE_SUBSYSTEM_WINDOWS_MINIPORT))
+#define PIPE_ATOMIC_OS_UNLOCKED
+#elif defined(PIPE_OS_SOLARIS)
+#define PIPE_ATOMIC_OS_SOLARIS
+#elif defined(PIPE_CC_MSVC)
+#define PIPE_ATOMIC_MSVC_INTRINSIC
+#elif (defined(PIPE_CC_MSVC) && defined(PIPE_ARCH_X86))
+#define PIPE_ATOMIC_ASM_MSVC_X86
+#elif (defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86))
+#define PIPE_ATOMIC_ASM_GCC_X86
+#elif (defined(PIPE_CC_GCC) && defined(PIPE_ARCH_X86_64))
+#define PIPE_ATOMIC_ASM_GCC_X86_64
+#elif defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 401)
+#define PIPE_ATOMIC_GCC_INTRINSIC
+#else
+#error "Unsupported platform"
+#endif
+
+
+#if defined(PIPE_ATOMIC_ASM_GCC_X86_64)
+#define PIPE_ATOMIC "GCC x86_64 assembly"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ unsigned char c;
+
+ __asm__ __volatile__("lock; decl %0; sete %1":"+m"(*v), "=qm"(c)
+ ::"memory");
+
+ return c != 0;
+}
+
+static INLINE void
+p_atomic_inc(int32_t *v)
+{
+ __asm__ __volatile__("lock; incl %0":"+m"(*v));
+}
+
+static INLINE void
+p_atomic_dec(int32_t *v)
+{
+ __asm__ __volatile__("lock; decl %0":"+m"(*v));
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
+{
+ return __sync_val_compare_and_swap(v, old, _new);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PIPE_ATOMIC_ASM_GCC_X86_64 */
+
+
+#if defined(PIPE_ATOMIC_ASM_GCC_X86)
+
+#define PIPE_ATOMIC "GCC x86 assembly"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ unsigned char c;
+
+ __asm__ __volatile__("lock; decl %0; sete %1":"+m"(*v), "=qm"(c)
+ ::"memory");
+
+ return c != 0;
+}
+
+static INLINE void
+p_atomic_inc(int32_t *v)
+{
+ __asm__ __volatile__("lock; incl %0":"+m"(*v));
+}
+
+static INLINE void
+p_atomic_dec(int32_t *v)
+{
+ __asm__ __volatile__("lock; decl %0":"+m"(*v));
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
+{
+ return __sync_val_compare_and_swap(v, old, _new);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+
+
+/* Implementation using GCC-provided synchronization intrinsics
+ */
+#if defined(PIPE_ATOMIC_GCC_INTRINSIC)
+
+#define PIPE_ATOMIC "GCC Sync Intrinsics"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ return (__sync_sub_and_fetch(v, 1) == 0);
+}
+
+static INLINE void
+p_atomic_inc(int32_t *v)
+{
+ (void) __sync_add_and_fetch(v, 1);
+}
+
+static INLINE void
+p_atomic_dec(int32_t *v)
+{
+ (void) __sync_sub_and_fetch(v, 1);
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
+{
+ return __sync_val_compare_and_swap(v, old, _new);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+
+
+/* Unlocked version for single threaded environments, such as some
+ * windows kernel modules.
+ */
+#if defined(PIPE_ATOMIC_OS_UNLOCKED)
+
+#define PIPE_ATOMIC "Unlocked"
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+#define p_atomic_dec_zero(_v) ((boolean) --(*(_v)))
+#define p_atomic_inc(_v) ((void) (*(_v))++)
+#define p_atomic_dec(_v) ((void) (*(_v))--)
+#define p_atomic_cmpxchg(_v, old, _new) (*(_v) == old ? *(_v) = (_new) : *(_v))
+
+#endif
+
+
+/* Locally coded assembly for MSVC on x86:
+ */
+#if defined(PIPE_ATOMIC_ASM_MSVC_X86)
+
+#define PIPE_ATOMIC "MSVC x86 assembly"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ unsigned char c;
+
+ __asm {
+ mov eax, [v]
+ lock dec dword ptr [eax]
+ sete byte ptr [c]
+ }
+
+ return c != 0;
+}
+
+static INLINE void
+p_atomic_inc(int32_t *v)
+{
+ __asm {
+ mov eax, [v]
+ lock inc dword ptr [eax]
+ }
+}
+
+static INLINE void
+p_atomic_dec(int32_t *v)
+{
+ __asm {
+ mov eax, [v]
+ lock dec dword ptr [eax]
+ }
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
+{
+ int32_t orig;
+
+ __asm {
+ mov ecx, [v]
+ mov eax, [old]
+ mov edx, [_new]
+ lock cmpxchg [ecx], edx
+ mov [orig], eax
+ }
+
+ return orig;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+
+#if defined(PIPE_ATOMIC_MSVC_INTRINSIC)
+
+#define PIPE_ATOMIC "MSVC Intrinsics"
+
+#include <intrin.h>
+
+#pragma intrinsic(_InterlockedIncrement)
+#pragma intrinsic(_InterlockedDecrement)
+#pragma intrinsic(_InterlockedCompareExchange)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ return _InterlockedDecrement((long *)v) == 0;
+}
+
+static INLINE void
+p_atomic_inc(int32_t *v)
+{
+ _InterlockedIncrement((long *)v);
+}
+
+static INLINE void
+p_atomic_dec(int32_t *v)
+{
+ _InterlockedDecrement((long *)v);
+}
+
+static INLINE int32_t
+p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new)
+{
+ return _InterlockedCompareExchange((long *)v, _new, old);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#if defined(PIPE_ATOMIC_OS_SOLARIS)
+
+#define PIPE_ATOMIC "Solaris OS atomic functions"
+
+#include <atomic.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define p_atomic_set(_v, _i) (*(_v) = (_i))
+#define p_atomic_read(_v) (*(_v))
+
+static INLINE boolean
+p_atomic_dec_zero(int32_t *v)
+{
+ uint32_t n = atomic_dec_32_nv((uint32_t *) v);
+
+ return n != 0;
+}
+
+#define p_atomic_inc(_v) atomic_inc_32((uint32_t *) _v)
+#define p_atomic_dec(_v) atomic_dec_32((uint32_t *) _v)
+
+#define p_atomic_cmpxchg(_v, _old, _new) \
+ atomic_cas_32( (uint32_t *) _v, (uint32_t) _old, (uint32_t) _new)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+
+#ifndef PIPE_ATOMIC
+#error "No pipe_atomic implementation selected"
+#endif
+
+
+
+#endif /* U_ATOMIC_H */
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