diff options
Diffstat (limited to 'src/event/ngx_event_busy_lock.c')
| -rw-r--r-- | src/event/ngx_event_busy_lock.c | 286 |
1 files changed, 0 insertions, 286 deletions
diff --git a/src/event/ngx_event_busy_lock.c b/src/event/ngx_event_busy_lock.c deleted file mode 100644 index fdac0da8f..000000000 --- a/src/event/ngx_event_busy_lock.c +++ /dev/null @@ -1,286 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> -#include <ngx_event.h> - - -static ngx_int_t ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl, - ngx_event_busy_lock_ctx_t *ctx); -static void ngx_event_busy_lock_handler(ngx_event_t *ev); -static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev); - - -/* - * NGX_OK: the busy lock is held - * NGX_AGAIN: the all busy locks are held but we will wait the specified time - * NGX_BUSY: ctx->timer == 0: there are many the busy locks - * ctx->timer != 0: there are many the waiting locks - */ - -ngx_int_t -ngx_event_busy_lock(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) -{ - ngx_int_t rc; - - ngx_mutex_lock(bl->mutex); - - ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0, - "event busy lock: b:%d mb:%d", - bl->busy, bl->max_busy); - - if (bl->busy < bl->max_busy) { - bl->busy++; - - rc = NGX_OK; - - } else if (ctx->timer && bl->waiting < bl->max_waiting) { - bl->waiting++; - ngx_add_timer(ctx->event, ctx->timer); - ctx->event->handler = ngx_event_busy_lock_handler; - - if (bl->events) { - bl->last->next = ctx; - - } else { - bl->events = ctx; - } - - bl->last = ctx; - - rc = NGX_AGAIN; - - } else { - rc = NGX_BUSY; - } - - ngx_mutex_unlock(bl->mutex); - - return rc; -} - - -ngx_int_t -ngx_event_busy_lock_cacheable(ngx_event_busy_lock_t *bl, - ngx_event_busy_lock_ctx_t *ctx) -{ - ngx_int_t rc; - - ngx_mutex_lock(bl->mutex); - - rc = ngx_event_busy_lock_look_cacheable(bl, ctx); - - ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0, - "event busy lock: %d w:%d mw:%d", - rc, bl->waiting, bl->max_waiting); - - /* - * NGX_OK: no the same request, there is free slot and we locked it - * NGX_BUSY: no the same request and there is no free slot - * NGX_AGAIN: the same request is processing - */ - - if (rc == NGX_AGAIN) { - - if (ctx->timer && bl->waiting < bl->max_waiting) { - bl->waiting++; - ngx_add_timer(ctx->event, ctx->timer); - ctx->event->handler = ngx_event_busy_lock_handler; - - if (bl->events == NULL) { - bl->events = ctx; - } else { - bl->last->next = ctx; - } - bl->last = ctx; - - } else { - rc = NGX_BUSY; - } - } - - ngx_mutex_unlock(bl->mutex); - - return rc; -} - - -void -ngx_event_busy_unlock(ngx_event_busy_lock_t *bl, - ngx_event_busy_lock_ctx_t *ctx) -{ - ngx_event_t *ev; - ngx_event_busy_lock_ctx_t *wakeup; - - ngx_mutex_lock(bl->mutex); - - if (bl->events) { - wakeup = bl->events; - bl->events = bl->events->next; - - } else { - wakeup = NULL; - bl->busy--; - } - - /* - * MP: all ctx's and their queue must be in shared memory, - * each ctx has pid to wake up - */ - - if (wakeup == NULL) { - ngx_mutex_unlock(bl->mutex); - return; - } - - if (ctx->md5) { - for (wakeup = bl->events; wakeup; wakeup = wakeup->next) { - if (wakeup->md5 == NULL || wakeup->slot != ctx->slot) { - continue; - } - - wakeup->handler = ngx_event_busy_lock_posted_handler; - wakeup->cache_updated = 1; - - ev = wakeup->event; - - ngx_post_event(ev, &ngx_posted_events); - } - - ngx_mutex_unlock(bl->mutex); - - } else { - bl->waiting--; - - ngx_mutex_unlock(bl->mutex); - - wakeup->handler = ngx_event_busy_lock_posted_handler; - wakeup->locked = 1; - - ev = wakeup->event; - - if (ev->timer_set) { - ngx_del_timer(ev); - } - - ngx_post_event(ev, &ngx_posted_events); - } -} - - -void -ngx_event_busy_lock_cancel(ngx_event_busy_lock_t *bl, - ngx_event_busy_lock_ctx_t *ctx) -{ - ngx_event_busy_lock_ctx_t *c, *p; - - ngx_mutex_lock(bl->mutex); - - bl->waiting--; - - if (ctx == bl->events) { - bl->events = ctx->next; - - } else { - p = bl->events; - for (c = bl->events->next; c; c = c->next) { - if (c == ctx) { - p->next = ctx->next; - break; - } - p = c; - } - } - - ngx_mutex_unlock(bl->mutex); -} - - -static ngx_int_t -ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl, - ngx_event_busy_lock_ctx_t *ctx) -{ - ngx_int_t free; - ngx_uint_t i, bit, cacheable, mask; - - bit = 0; - cacheable = 0; - free = -1; - -#if (NGX_SUPPRESS_WARN) - mask = 0; -#endif - - for (i = 0; i < bl->max_busy; i++) { - - if ((bit & 7) == 0) { - mask = bl->md5_mask[i / 8]; - } - - if (mask & 1) { - if (ngx_memcmp(&bl->md5[i * 16], ctx->md5, 16) == 0) { - ctx->waiting = 1; - ctx->slot = i; - return NGX_AGAIN; - } - cacheable++; - - } else if (free == -1) { - free = i; - } - - if (cacheable == bl->cacheable) { - if (free == -1 && cacheable < bl->max_busy) { - free = i + 1; - } - - break; - } - - mask >>= 1; - bit++; - } - - if (free == -1) { - return NGX_BUSY; - } - -#if 0 - if (bl->busy == bl->max_busy) { - return NGX_BUSY; - } -#endif - - ngx_memcpy(&bl->md5[free * 16], ctx->md5, 16); - bl->md5_mask[free / 8] |= 1 << (free & 7); - ctx->slot = free; - - bl->cacheable++; - bl->busy++; - - return NGX_OK; -} - - -static void -ngx_event_busy_lock_handler(ngx_event_t *ev) -{ - ev->handler = ngx_event_busy_lock_posted_handler; - - ngx_post_event(ev, &ngx_posted_events); -} - - -static void -ngx_event_busy_lock_posted_handler(ngx_event_t *ev) -{ - ngx_event_busy_lock_ctx_t *ctx; - - ctx = ev->data; - ctx->handler(ev); -} |