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annotate src/core/ngx_atomic.h @ 300:502b03d9d2a3

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nginx-0.0.3-2004-03-31-00:31:58 import
author Igor Sysoev <igor@sysoev.ru>
date Tue, 30 Mar 2004 20:31:58 +0000
parents 46b7eeb8a116
children 744965ec6275
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679f60139863 nginx-0.0.1-2003-12-19-11:15:11 import
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1 #ifndef _NGX_ATOMIC_H_INCLUDED_
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2 #define _NGX_ATOMIC_H_INCLUDED_
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679f60139863 nginx-0.0.1-2003-12-19-11:15:11 import
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5 #include <ngx_config.h>
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6 #include <ngx_core.h>
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9 #if ( __i386__ || __amd64__ )
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11 typedef volatile uint32_t ngx_atomic_t;
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13 #if (NGX_SMP)
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14 #define NGX_SMP_LOCK "lock;"
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15 #else
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16 #define NGX_SMP_LOCK
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17 #endif
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20 static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value)
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21 {
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22 uint32_t old;
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24 __asm__ volatile (
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26 NGX_SMP_LOCK
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502b03d9d2a3 nginx-0.0.3-2004-03-31-00:31:58 import
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27 " xaddl %0, %2; "
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502b03d9d2a3 nginx-0.0.3-2004-03-31-00:31:58 import
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29 : "=q" (old) : "0" (1), "m" (*value));
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31 return old;
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32 }
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35 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value)
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36 {
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37 uint32_t old;
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38
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39 __asm__ volatile (
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41 NGX_SMP_LOCK
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42 " xaddl %0, %1; "
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502b03d9d2a3 nginx-0.0.3-2004-03-31-00:31:58 import
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44 : "=q" (old) : "0" (-1), "m" (*value));
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45
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46 return old;
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47 }
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50 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock,
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51 ngx_atomic_t old,
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52 ngx_atomic_t set)
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53 {
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54 uint32_t res;
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55
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56 __asm__ volatile (
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58 NGX_SMP_LOCK
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59 " cmpxchgl %3, %1; "
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60 " setz %%al; "
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61 " movzbl %%al, %0; "
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63 : "=a" (res) : "m" (*lock), "a" (old), "q" (set));
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64
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65 return res;
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66 }
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67
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68 #else
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70 typedef volatile uint32_t ngx_atomic_t;
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71
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72 /* STUB */
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73 #define ngx_atomic_inc(x) (*(x))++;
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74 #define ngx_atomic_dec(x) (*(x))--;
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75 #define ngx_atomic_cmp_set(lock, old, set) 1;
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76 /**/
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77
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78 #endif
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81 #endif /* _NGX_ATOMIC_H_INCLUDED_ */