diff options
Diffstat (limited to 'src/gallium/auxiliary/util')
-rw-r--r-- | src/gallium/auxiliary/util/u_atomic.h | 247 | ||||
-rw-r--r-- | src/gallium/auxiliary/util/u_inlines.h | 2 | ||||
-rw-r--r-- | src/gallium/auxiliary/util/u_ringbuffer.c | 2 |
3 files changed, 249 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/util/u_atomic.h b/src/gallium/auxiliary/util/u_atomic.h new file mode 100644 index 0000000000..1c042c3ede --- /dev/null +++ b/src/gallium/auxiliary/util/u_atomic.h @@ -0,0 +1,247 @@ +/** + * 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" + +#ifdef __cplusplus +extern "C" { +#endif + + +/* 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_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) +#define PIPE_ATOMIC_GCC_INTRINSIC +#else +#error "Unsupported platform" +#endif + + + +#if defined(PIPE_ATOMIC_ASM_GCC_X86) + +#define PIPE_ATOMIC "GCC x86 assembly" + +#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); +} +#endif + + + +/* Implementation using GCC-provided synchronization intrinsics + */ +#if defined(PIPE_ATOMIC_GCC_INTRINSIC) + +#define PIPE_ATOMIC "GCC Sync Intrinsics" + +#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); +} +#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" + +#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; +} +#endif + + +#if defined(PIPE_ATOMIC_MSVC_INTRINSIC) + +#define PIPE_ATOMIC "MSVC Intrinsics" + +#include <intrin.h> + +#pragma intrinsic(_InterlockedIncrement) +#pragma intrinsic(_InterlockedDecrement) +#pragma intrinsic(_InterlockedCompareExchange) + +#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(v) == 0; +} + +static INLINE void +p_atomic_inc(int32_t *v) +{ + _InterlockedIncrement(v); +} + +static INLINE void +p_atomic_dec(int32_t *v) +{ + _InterlockedDecrement(v); +} + +static INLINE int32_t +p_atomic_cmpxchg(int32_t *v, int32_t old, int32_t _new) +{ + return _InterlockedCompareExchange(v, _new, old); +} + +#endif + + + +#ifndef PIPE_ATOMIC +#error "No pipe_atomic implementation selected" +#endif + + + +#ifdef __cplusplus +} +#endif + +#endif /* U_ATOMIC_H */ diff --git a/src/gallium/auxiliary/util/u_inlines.h b/src/gallium/auxiliary/util/u_inlines.h index 72a4d6d508..e95d58ea86 100644 --- a/src/gallium/auxiliary/util/u_inlines.h +++ b/src/gallium/auxiliary/util/u_inlines.h @@ -33,7 +33,7 @@ #include "pipe/p_state.h" #include "pipe/p_screen.h" #include "util/u_debug.h" -#include "pipe/p_atomic.h" +#include "util/u_atomic.h" #ifdef __cplusplus diff --git a/src/gallium/auxiliary/util/u_ringbuffer.c b/src/gallium/auxiliary/util/u_ringbuffer.c index 3f43a19e01..95d45ebb71 100644 --- a/src/gallium/auxiliary/util/u_ringbuffer.c +++ b/src/gallium/auxiliary/util/u_ringbuffer.c @@ -1,5 +1,5 @@ -#include "pipe/p_thread.h" +#include "os/os_thread.h" #include "pipe/p_defines.h" #include "util/u_ringbuffer.h" #include "util/u_math.h" |