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ngx_atomic.h
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#ifndef _NGX_ATOMIC_H_INCLUDED_
#define _NGX_ATOMIC_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#if (NGX_HAVE_LIBATOMIC)
#define AO_REQUIRE_CAS
#include <atomic_ops.h>
#define NGX_HAVE_ATOMIC_OPS 1
typedef long ngx_atomic_int_t;
typedef AO_t ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#if (NGX_PTR_SIZE == 8)
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#else
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#endif
#define ngx_atomic_cmp_set(lock, old, new) \
AO_compare_and_swap(lock, old, new)
#define ngx_atomic_fetch_add(value, add) \
AO_fetch_and_add(value, add)
#define ngx_memory_barrier() AO_nop()
#define ngx_cpu_pause()
#elif (NGX_HAVE_GCC_ATOMIC)
/* GCC 4.1 builtin atomic operations */
#define NGX_HAVE_ATOMIC_OPS 1
typedef long ngx_atomic_int_t;
typedef unsigned long ngx_atomic_uint_t;
#if (NGX_PTR_SIZE == 8)
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#else
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#endif
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#define ngx_atomic_cmp_set(lock, old, set) \
__sync_bool_compare_and_swap(lock, old, set)
#define ngx_atomic_fetch_add(value, add) \
__sync_fetch_and_add(value, add)
#define ngx_memory_barrier() __sync_synchronize()
#if ( __i386__ || __i386 || __amd64__ || __amd64 )
#define ngx_cpu_pause() __asm__ ("pause")
#else
#define ngx_cpu_pause()
#endif
#elif (NGX_DARWIN_ATOMIC)
/*
* use Darwin 8 atomic(3) and barrier(3) operations
* optimized at run-time for UP and SMP
*/
#include <libkern/OSAtomic.h>
/* "bool" conflicts with perl's CORE/handy.h */
#if 0
#undef bool
#endif
#define NGX_HAVE_ATOMIC_OPS 1
#if (NGX_PTR_SIZE == 8)
typedef int64_t ngx_atomic_int_t;
typedef uint64_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#define ngx_atomic_cmp_set(lock, old, new) \
OSAtomicCompareAndSwap64Barrier(old, new, (int64_t *) lock)
#define ngx_atomic_fetch_add(value, add) \
(OSAtomicAdd64(add, (int64_t *) value) - add)
#else
typedef int32_t ngx_atomic_int_t;
typedef uint32_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#define ngx_atomic_cmp_set(lock, old, new) \
OSAtomicCompareAndSwap32Barrier(old, new, (int32_t *) lock)
#define ngx_atomic_fetch_add(value, add) \
(OSAtomicAdd32(add, (int32_t *) value) - add)
#endif
#define ngx_memory_barrier() OSMemoryBarrier()
#define ngx_cpu_pause()
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#elif ( __i386__ || __i386 )
typedef int32_t ngx_atomic_int_t;
typedef uint32_t ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#if ( __SUNPRO_C )
#define NGX_HAVE_ATOMIC_OPS 1
ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
ngx_atomic_uint_t set);
ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add);
/*
* Sun Studio 12 exits with segmentation fault on '__asm ("pause")',
* so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_x86.il
*/
void
ngx_cpu_pause(void);
/* the code in src/os/unix/ngx_sunpro_x86.il */
#define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile")
#else /* ( __GNUC__ || __INTEL_COMPILER ) */
#define NGX_HAVE_ATOMIC_OPS 1
#include "ngx_gcc_atomic_x86.h"
#endif
#elif ( __amd64__ || __amd64 )
typedef int64_t ngx_atomic_int_t;
typedef uint64_t ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#if ( __SUNPRO_C )
#define NGX_HAVE_ATOMIC_OPS 1
ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
ngx_atomic_uint_t set);
ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add);
/*
* Sun Studio 12 exits with segmentation fault on '__asm ("pause")',
* so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_amd64.il
*/
void
ngx_cpu_pause(void);
/* the code in src/os/unix/ngx_sunpro_amd64.il */
#define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile")
#else /* ( __GNUC__ || __INTEL_COMPILER ) */
#define NGX_HAVE_ATOMIC_OPS 1
#include "ngx_gcc_atomic_amd64.h"
#endif
#elif ( __sparc__ || __sparc || __sparcv9 )
#if (NGX_PTR_SIZE == 8)
typedef int64_t ngx_atomic_int_t;
typedef uint64_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#else
typedef int32_t ngx_atomic_int_t;
typedef uint32_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#endif
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#if ( __SUNPRO_C )
#define NGX_HAVE_ATOMIC_OPS 1
#include "ngx_sunpro_atomic_sparc64.h"
#else /* ( __GNUC__ || __INTEL_COMPILER ) */
#define NGX_HAVE_ATOMIC_OPS 1
#include "ngx_gcc_atomic_sparc64.h"
#endif
#elif ( __powerpc__ || __POWERPC__ )
#define NGX_HAVE_ATOMIC_OPS 1
#if (NGX_PTR_SIZE == 8)
typedef int64_t ngx_atomic_int_t;
typedef uint64_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1)
#else
typedef int32_t ngx_atomic_int_t;
typedef uint32_t ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
#endif
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#include "ngx_gcc_atomic_ppc.h"
#endif
#if !(NGX_HAVE_ATOMIC_OPS)
#define NGX_HAVE_ATOMIC_OPS 0
typedef int32_t ngx_atomic_int_t;
typedef uint32_t ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t ngx_atomic_t;
#define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1)
static ngx_inline ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
ngx_atomic_uint_t set)
{
if (*lock == old) {
*lock = set;
return 1;
}
return 0;
}
static ngx_inline ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
{
ngx_atomic_int_t old;
old = *value;
*value += add;
return old;
}
#define ngx_memory_barrier()
#define ngx_cpu_pause()
#endif
void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin);
#define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))
#define ngx_unlock(lock) *(lock) = 0
#endif /* _NGX_ATOMIC_H_INCLUDED_ */