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view src/os/unix/ngx_atomic.h @ 5396:42f874c0b970

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Mail: added session close on smtp_greeting_delay violation. A server MUST send greeting before other replies, while before this change in case of smtp_greeting_delay violation the 220 greeting was sent after several 503 replies to commands received before greeting, resulting in protocol synchronization loss. Moreover, further commands were accepted after the greeting. While closing a connection isn't strictly RFC compliant (RFC 5321 requires servers to wait for a QUIT before closing a connection), it's probably good enough for practial uses.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 30 Sep 2013 22:09:50 +0400
parents 4c36e15651f7
children 2cd019520210
line wrap: on
line source


/*
 * 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_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 (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 ( __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_ */