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typedef struct { //ÄÚ´æ³ØµÄÊý¾Ý½á¹¹Ä£¿é 02. u_char *last; //µ±Ç°ÄÚ´æ·ÖÅä½áÊøÎ»Ö㬼´ÏÂÒ»¶Î¿É·ÖÅäÄÚ´æµÄÆðʼλÖà 03. u_char *end; //ÄÚ´æ³ØµÄ½áÊøÎ»Öà 04. ngx_pool_t *next; //Á´½Óµ½ÏÂÒ»¸öÄÚ´æ³Ø£¬ÄÚ´æ³ØµÄºÜ¶à¿éÄÚ´æ¾ÍÊÇͨ¹ý¸ÃÖ¸ÕëÁ¬³ÉÁ´±íµÄ 05. ngx_uint_t failed; //¼Ç¼ÄÚ´æ·ÖÅä²»ÄÜÂú×ãÐèÇóµÄʧ°Ü´ÎÊý 06. } ngx_pool_data_t; //½á¹¹ÓÃÀ´Î¬»¤ÄÚ´æ³ØµÄÊý¾Ý¿é£¬¹©Óû§·ÖÅäÖ®Óá£
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struct ngx_pool_s { //ÄÚ´æ³ØµÄ¹ÜÀí·ÖÅäÄ£¿é 02. ngx_pool_data_t d; //ÄÚ´æ³ØµÄÊý¾Ý¿é£¨ÉÏÃæÒÑÓÐÃèÊö£©£¬ÉèΪd 03. size_t max; //Êý¾Ý¿é´óС£¬Ð¡¿éÄÚ´æµÄ×î´óÖµ 04. ngx_pool_t *current; //Ö¸Ïòµ±Ç°»ò±¾ÄÚ´æ³Ø 05. ngx_chain_t *chain; //¸ÃÖ¸Õë¹Ò½ÓÒ»¸öngx_chain_t½á¹¹ 06. ngx_pool_large_t *large; //Ö¸Ïò´ó¿éÄÚ´æ·ÖÅ䣬nginxÖУ¬´ó¿éÄÚ´æ·ÖÅäÖ±½Ó²ÉÓñê׼ϵͳ½Ó¿Úmalloc 07. ngx_pool_cleanup_t *cleanup; //Îö¹¹º¯Êý£¬¹ÒÔØÄÚ´æÊÍ·ÅʱÐèÒªÇåÀí×ÊÔ´µÄһЩ±ØÒª²Ù×÷ 08. ngx_log_t *log; //ÄÚ´æ·ÖÅäÏà¹ØµÄÈÕÖ¾¼Ç¼ 09. };
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struct ngx_pool_large_s { 02. ngx_pool_large_t *next; 03. void *alloc; 04. };
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typedef struct { 02. ngx_fd_t fd; 03. u_char *name; 04. ngx_log_t *log; 05. } ngx_pool_cleanup_file_t;
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#define NGX_MAX_ALLOC_FROM_POOL (ngx_pagesize - 1) //ÔÚx86Ìåϵ½á¹¹Ï£¬¸ÃÖµÒ»°ãΪ4096B£¬¼´4K |
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ngx_pool_t * 02. ngx_create_pool(size_t size, ngx_log_t *log) 03. { 04. ngx_pool_t *p; 05. 06. p = ngx_memalign(NGX_POOL_ALIGNMENT, size, log); 07. //ngx_memalign()º¯ÊýÖ´ÐÐÄÚ´æ·ÖÅ䣬
¸Ãº¯ÊýµÄʵÏÖÔÚsrc/os/unix/ngx_alloc.cÎļþÖУ¨¼Ù¶¨NGX_HAVE_POSIX_MEMALIGN±»¶¨Ò壩£º 08. 09. if (p == NULL) { 10. return NULL; 11. } 12. 13. p->d.last = (u_char *) p + sizeof(ngx_pool_t); 14. p->d.end = (u_char *) p + size; 15. p->d.next = NULL; 16. p->d.failed = 0; 17. 18. size = size - sizeof(ngx_pool_t); 19. p->max = (size < NGX_MAX_ALLOC_FROM_POOL) ? size : NGX_MAX_ALLOC_FROM_POOL; 20. //×î´ó²»³¬¹ý4095B£¬±ðÍüÁËÉÏÃæNGX_MAX_ALLOC_FROM_POOLµÄ¶¨Òå 21. 22. p->current = p; 23. p->chain = NULL; 24. p->large = NULL; 25. p->cleanup = NULL; 26. p->log = log; 27. 28. return p; 29. }
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void * 02. ngx_memalign(size_t alignment, size_t size, ngx_log_t *log) 03. { 04. void *p; 05. int err; 06. 07. err = posix_memalign(&p, alignment, size); 08. //¸Ãº¯Êý·ÖÅäÒÔalignmentΪ¶ÔÆëµÄsize×Ö½ÚµÄÄÚ´æ´óС£¬ÆäÖÐpÖ¸Ïò·ÖÅäµÄÄÚ´æ¿é¡£ 09. 10. if (err) { 11. ngx_log_error(NGX_LOG_EMERG, log, err, 12. "posix_memalign(%uz, %uz) failed", alignment, size); 13. p = NULL; 14. } 15. 16. ngx_log_debug3(NGX_LOG_DEBUG_ALLOC, log, 0, 17. "posix_memalign: %p:%uz @%uz", p, size, alignment); 18. 19. return p; 20. } 21. //´ÓÕâ¸öº¯ÊýµÄʵÏÖÌ壬ÎÒÃÇ¿ÉÒÔ¿´µ½p = ngx_memalign(NGX_POOL_ALIGNMENT, size, log); 22. //º¯Êý·ÖÅäÒÔNGX_POOL_ALIGNMENT×Ö½Ú¶ÔÆëµÄsize×Ö½ÚµÄÄڴ棬ÔÚsrc/core/ngx_palloc.hÎļþÖУº
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#define NGX_POOL_ALIGNMENT 16 |
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void 02. ngx_destroy_pool(ngx_pool_t *pool) 03. { 04. ngx_pool_t *p, *n; 05. ngx_pool_large_t *l; 06. ngx_pool_cleanup_t *c; 07. 08. for (c = pool->cleanup; c; c = c->next) { 09. if (c->handler) { 10. ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, 11. "run cleanup: %p", c); 12. c->handler(c->data); 13. } 14. } 15. //Ç°Ãæ½²µ½£¬cleanupÖ¸ÏòÎö¹¹º¯Êý£¬ÓÃÓÚÖ´ÐÐÏà¹ØµÄÄÚ´æ³ØÏú»Ù֮ǰµÄÇåÀí¹¤×÷£¬ÈçÎļþµÄ¹Ø±ÕµÈ£¬ 16. //ÇåÀíº¯ÊýÊÇÒ»¸öhandlerµÄº¯ÊýÖ¸Õë¹ÒÔØ¡£Òò´Ë£¬ÔÚÕⲿ·Ö£¬¶ÔÄÚ´æ³ØÖеÄÎö¹¹º¯Êý±éÀúµ÷Óᣠ17. 18. for (l = pool->large; l; l = l->next) { 19. ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc); 20. 21. if (l->alloc) { 22. ngx_free(l->alloc); 23. } 24. } 25. //ÕâÒ»²¿·ÖÓÃÓÚÇåÀí´ó¿éÄڴ棬ngx_freeʵ¼ÊÉϾÍÊDZê×¼µÄfreeº¯Êý£¬ 26. //¼´´óÄÚ´æ¿é¾ÍÊÇͨ¹ýmallocºÍfree²Ù×÷½øÐйÜÀíµÄ¡£ 27. 28. #if (NGX_DEBUG) 29. 30. /** 31. * we could allocate the pool->log from this pool 32. * so we can not use this log while the free()ing the pool 33. */ 34. 35. for (p = pool, n = pool->d.next; /** void */; p = n, n = n->d.next) { 36. ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0, 37. "free: %p, unused: %uz", p, p->d.end - p->d.last); 38. 39. if (n == NULL) { 40. break; 41. } 42. } 43. //Ö»ÓÐdebugģʽ²Å»áÖ´ÐÐÕâ¸öƬ¶ÎµÄ´úÂ룬Ö÷ÒªÊÇlog¼Ç¼£¬ÓÃÒÔ¸ú×Ùº¯ÊýÏú»ÙʱÈÕÖ¾¼Ç¼¡£ 44. #endif 45. 46. for (p = pool, n = pool->d.next; /** void */; p = n, n = n->d.next) { 47. ngx_free(p); 48. 49. if (n == NULL) { 50. break; 51. } 52. } 53. } 54. //¸ÃƬ¶Î³¹µ×Ïú»ÙÄÚ´æ³Ø±¾Éí¡£
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void ngx_reset_pool(ngx_pool_t *pool) |
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void 02. ngx_reset_pool(ngx_pool_t *pool) 03. { 04. ngx_pool_t *p; 05. ngx_pool_large_t *l; 06. 07. for (l = pool->large; l; l = l->next) { 08. if (l->alloc) { 09. ngx_free(l->alloc); 10. } 11. } 12. //ÉÏÊöƬ¶ÎÖ÷ÒªÓÃÓÚÇåÀíʹÓõ½µÄ´ó¿éÄÚ´æ¡£ 13. 14. pool->large = NULL; 15. 16. for (p = pool; p; p = p->d.next) { 17. p->d.last = (u_char *) p + sizeof(ngx_pool_t); 18. } 19. }
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void * 02. ngx_palloc(ngx_pool_t *pool, size_t size) 03. { 04. u_char *m; 05. ngx_pool_t *p; 06. 07. //Åжϴý·ÖÅäÄÚ´æÓëmaxÖµ 08. //1¡¢Ð¡ÓÚmaxÖµ£¬Ôò´Ócurrent½áµã¿ªÊ¼±éÀúpoolÁ´±í 09. if (size <= pool->max) { 10. 11. p = pool->current; 12. 13. do { 14. //Ö´ÐÐ¶ÔÆë²Ù×÷£¬ 15. //¼´ÒÔlast¿ªÊ¼£¬¼ÆËãÒÔNGX_ALIGNMENT¶ÔÆëµÄÆ«ÒÆÎ»ÖÃÖ¸Õ룬 16. m = ngx_align_ptr(p->d.last, NGX_ALIGNMENT); 17. 18. //È»ºó¼ÆËãendÖµ¼õÈ¥Õâ¸öÆ«ÒÆÖ¸ÕëλÖõĴóСÊÇ·ñÂú×ãË÷Òª·ÖÅäµÄsize´óС£¬ 19. //Èç¹ûÂú×㣬ÔòÒÆ¶¯lastÖ¸ÕëλÖ㬲¢·µ»ØËù·ÖÅäµ½µÄÄÚ´æµØÖ·µÄÆðʼµØÖ·£» 20. if ((size_t) (p->d.end - m) >= size) { 21. p->d.last = m + size; 22. //ÔڸýáµãÖ¸ÏòµÄÄÚ´æ¿éÖзÖÅäsize´óСµÄÄÚ´æ 23. 24. return m; 25. } 26. 27. //Èç¹û²»Âú×㣬Ôò²éÕÒÏÂÒ»¸öÁ´¡£ 28. p = p->d.next; 29. 30. } while (p); 31. 32. //Èç¹û±éÀúÍêÕû¸öÄÚ´æ³ØÁ´±í¾ùδÕÒµ½ºÏÊÊ´óСµÄÄÚ´æ¿é¹©·ÖÅ䣬ÔòÖ´ÐÐngx_palloc_block()À´·ÖÅä¡£ 33. 34. //ngx_palloc_block()º¯ÊýΪ¸ÃÄÚ´æ³ØÔÙ·ÖÅäÒ»¸öblock£¬¸ÃblockµÄ´óСΪÁ´±íÖÐÇ°ÃæÃ¿Ò»¸öblock´óСµÄÖµ¡£ 35. //Ò»¸öÄÚ´æ³ØÊÇÓɶà¸öblockÁ´½ÓÆðÀ´µÄ¡£·ÖÅä³É¹¦ºó£¬½«¸ÃblockÁ´Èë¸ÃpollÁ´µÄ×îºó£¬ 36. //ͬʱ£¬ÎªËùÒª·ÖÅäµÄsize´óСµÄÄÚ´æ½øÐзÖÅ䣬²¢·µ»Ø·ÖÅäÄÚ´æµÄÆðʼµØÖ·¡£ 37. return ngx_palloc_block(pool, size); //2.4.1½Ú·ÖÎö 38. 39. } 40. //2¡¢Èç¹û´óÓÚmaxÖµ£¬ÔòÖ´Ðдó¿éÄÚ´æ·ÖÅäµÄº¯Êýngx_palloc_large£¬ÔÚlargeÁ´±íÀï·ÖÅäÄÚ´æ 41. return ngx_palloc_large(pool, size); //2.4.2½Ú·ÖÎö 42. }
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static void * 02. ngx_palloc_block(ngx_pool_t *pool, size_t size) 03. { 04. u_char *m; 05. size_t psize; 06. ngx_pool_t *p, *new, *current; 07. 08. psize = (size_t) (pool->d.end - (u_char *) pool); 09. //¼ÆËãpoolµÄ´óС£¬¼´ÐèÒª·ÖÅäµÄblockµÄ´óС 10. 11. m = ngx_memalign(NGX_POOL_ALIGNMENT, psize, pool->log); 12. if (m == NULL) { 13. return NULL; 14. } 15. //Ö´Ðа´NGX_POOL_ALIGNMENT¶ÔÆë·½Ê½µÄÄÚ´æ·ÖÅ䣬¼ÙÉèÄܹ»·ÖÅä³É¹¦£¬Ôò¼ÌÐøÖ´ÐкóÐø´úÂëÆ¬¶Î¡£ 16. 17. //ÕâÀï¼ÆËãÐèÒª·ÖÅäµÄblockµÄ´óС 18. new = (ngx_pool_t *) m; 19. 20. new->d.end = m + psize; 21. new->d.next = NULL; 22. new->d.failed = 0; 23. //Ö´ÐиÃblockÏà¹ØµÄ³õʼ»¯¡£ 24. 25. m += sizeof(ngx_pool_data_t); 26. //ÈÃmÖ¸Ïò¸Ã¿éÄÚ´ængx_pool_data_t½á¹¹ÌåÖ®ºóÊý¾ÝÇøÆðʼλÖà 27. m = ngx_align_ptr(m, NGX_ALIGNMENT); 28. new->d.last = m + size; 29. //ÔÚÊý¾ÝÇø·ÖÅäsize´óСµÄÄÚ´æ²¢ÉèÖÃlastÖ¸Õë 30. 31. current = pool->current; 32. 33. for (p = current; p->d.next; p = p->d.next) { 34. if (p->d.failed++ > 4) { 35. current = p->d.next; 36. //ʧ°Ü4´ÎÒÔÉÏÒÆ¶¯currentÖ¸Õë 37. } 38. } 39. 40. p->d.next = new; 41. //½«·ÖÅäµÄblockÁ´ÈëÄÚ´æ³Ø 42. 43. pool->current = current ? current : new; 44. //Èç¹ûÊǵÚÒ»´ÎΪÄÚ´æ³Ø·ÖÅäblock£¬Õâcurrent½«Ö¸ÏòзÖÅäµÄblock¡£ 45. 46. return m; 47. }
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//ÕâÊÇÒ»¸östaticµÄº¯Êý£¬ËµÃ÷Íⲿº¯Êý²»»áËæ±ãµ÷Ó㬶øÊÇÌṩ¸øÄÚ²¿·ÖÅäµ÷Óõģ¬ 02. //¼´nginxÔÚ½øÐÐÄÚ´æ·ÖÅäÐèÇóʱ£¬²»»á×ÔÐÐÈ¥ÅжÏÊÇ·ñÊÇ´ó¿éÄڴ滹ÊÇС¿éÄڴ棬 03. //¶øÊǽ»ÓÉÄÚ´æ·ÖÅ亯ÊýÈ¥Åжϣ¬¶ÔÓÚÓû§ÐèÇóÀ´ËµÊÇÍêȫ͸Ã÷µÄ¡£ 04. static void * 05. ngx_palloc_large(ngx_pool_t *pool, size_t size) 06. { 07. void *p; 08. ngx_uint_t n; 09. ngx_pool_large_t *large; 10. 11. p = ngx_alloc(size, pool->log); //ÏÂÎĽô½Ó׎«·ÖÎö´Ëngx_allocº¯Êý 12. if (p == NULL) { 13. return NULL; 14. } 15. 16. n = 0; 17. 18. //ÒÔϼ¸ÐУ¬½«·ÖÅäµÄÄÚ´æÁ´ÈëpoolµÄlargeÁ´ÖУ¬ 19. //ÕâÀïÖ¸ÔʼpoolÔÚ֮ǰÒѾ·ÖÅä¹ýlargeÄÚ´æµÄÇé¿ö¡£ 20. for (large = pool->large; large; large = large->next) { 21. if (large->alloc == NULL) { 22. large->alloc = p; 23. return p; 24. } 25. 26. if (n++ > 3) { 27. break; 28. } 29. } 30. 31. //Èç¹û¸Ãpool֮ǰ²¢Î´·ÖÅälargeÄڴ棬Ôò¾ÍûÓÐngx_pool_large_tÀ´¹ÜÀí´ó¿éÄÚ´æ 32. //Ö´ÐÐngx_pool_large_t½á¹¹ÌåµÄ·ÖÅ䣬ÓÃÓÚÀ´¹ÜÀílargeÄÚ´æ¿é¡£ 33. large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); 34. if (large == NULL) { 35. ngx_free(p); 36. return NULL; 37. } 38. 39. large->alloc = p; 40. large->next = pool->large; 41. pool->large = large; 42. 43. return p; 44. }
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void * 02. ngx_alloc(size_t size, ngx_log_t *log) 03. { 04. void *p; 05. 06. p = malloc(size); 07. //´ÓÕâÀï¿ÉÒÔ¿´µ½£¬ngx_allocʵ¼ÊÉϾÍÊǵ÷ÓÃmallocº¯Êý·ÖÅäÄÚ´æµÄ¡£ 08. 09. if (p == NULL) { 10. ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, 11. "malloc() %uz bytes failed", size); 12. } 13. 14. ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, log, 0, "malloc: %p:%uz", p, size); 15. 16. return p; 17. }
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2.4.2¡¢ngx_pcallocÓëngx_pmemalignº¯Êý
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void * 02. ngx_pcalloc(ngx_pool_t *pool, size_t size) 03. { 04. void *p; 05. 06. p = ngx_palloc(pool, size); 07. if (p) { 08. ngx_memzero(p, size); 09. } 10. 11. return p; 12. }
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void * 02. ngx_pmemalign(ngx_pool_t *pool, size_t size, size_t alignment) 03. { 04. void *p; 05. ngx_pool_large_t *large; 06. 07. p = ngx_memalign(alignment, size, pool->log); 08. if (p == NULL) { 09. return NULL; 10. } 11. 12. large = ngx_palloc(pool, sizeof(ngx_pool_large_t)); 13. if (large == NULL) { 14. ngx_free(p); 15. return NULL; 16. } 17. 18. large->alloc = p; 19. large->next = pool->large; 20. pool->large = large; 21. 22. return p; 23. }
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if (p == l->alloc) { 02. ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, 03. "free: %p", l->alloc); 04. ngx_free(l->alloc); 05. l->alloc = NULL; 06. 07. return NGX_OK; 08. } 09. } 10. 11. return NGX_DECLINED;
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ngx_pool_cleanup_t * 02. ngx_pool_cleanup_add(ngx_pool_t *p, size_t size) 03. { 04. ngx_pool_cleanup_t *c; 05. 06. c = ngx_palloc(p, sizeof(ngx_pool_cleanup_t)); 07. if (c == NULL) { 08. return NULL; 09. } 10. 11. if (size) { 12. c->data = ngx_palloc(p, size); 13. if (c->data == NULL) { 14. return NULL; 15. } 16. 17. } else { 18. c->data = NULL; 19. } 20. 21. c->handler = NULL; 22. c->next = p->cleanup; 23. 24. p->cleanup = c; 25. 26. ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, p->log, 0, "add cleanup: %p", c); 27. 28. return c; 29. }
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void 02. ngx_pool_run_cleanup_file(ngx_pool_t *p, ngx_fd_t fd) 03. { 04. //.... 05. } 06. 07. void 08. ngx_pool_cleanup_file(void *data) 09. { 10. //.... 11. } 12. 13. void 14. ngx_pool_delete_file(void *data) 15. { 16. //... 17. }
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//¸Ã½á¹¹ÓÃÀ´Î¬»¤ÄÚ´æ³ØµÄÊý¾Ý¿é£¬¹©Óû§·ÖÅäÖ®Óᣠ02. typedef struct { 03. u_char *last; //µ±Ç°ÄÚ´æ·ÖÅä½áÊøÎ»Ö㬼´ÏÂÒ»¶Î¿É·ÖÅäÄÚ´æµÄÆðʼλÖà 04. u_char *end; //ÄÚ´æ³Ø½áÊøÎ»Öà 05. ngx_pool_t *next; //Á´½Óµ½ÏÂÒ»¸öÄÚ´æ³Ø 06. ngx_uint_t failed; //ͳ¼Æ¸ÃÄÚ´æ³Ø²»ÄÜÂú×ã·ÖÅäÇëÇóµÄ´ÎÊý 07. } ngx_pool_data_t;
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struct ngx_pool_s { 02. ngx_pool_data_t d; //Êý¾Ý¿é 03. size_t max; //Êý¾Ý¿éµÄ´óС£¬¼´Ð¡¿éÄÚ´æµÄ×î´óÖµ 04. ngx_pool_t *current; //±£´æµ±Ç°ÄÚ´æ³Ø 05. ngx_chain_t *chain; //¿ÉÒÔ¹ÒÒ»¸öchain½á¹¹ 06. ngx_pool_large_t *large; //·ÖÅä´ó¿éÄÚ´æÓ㬼´³¬¹ýmaxµÄÄÚ´æÇëÇó 07. ngx_pool_cleanup_t *cleanup; //¹ÒÔØÒ»Ð©ÄÚ´æ³ØÊͷŵÄʱºò£¬Í¬Ê±ÊͷŵÄ×ÊÔ´¡£ 08. ngx_log_t *log; 09. };
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