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view src/core/ngx_shmtx.h @ 7166:a762ddf22dbb

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Upstream: flush low-level buffers on write retry. If the data to write is bigger than what the socket can send, and the reminder is smaller than NGX_SSL_BUFSIZE, then SSL_write() fails with SSL_ERROR_WANT_WRITE. The reminder of payload however is successfully copied to the low-level buffer and all the output chain buffers are flushed. This means that retry logic doesn't work because ngx_http_upstream_process_non_buffered_request() checks only if there's anything in the output chain buffers and ignores the fact that something may be buffered in low-level parts of the stack. Signed-off-by: Patryk Lesiewicz <patryk@google.com>
author Patryk Lesiewicz <patryk@google.com>
date Fri, 01 Dec 2017 15:59:14 -0800
parents 512c741fa841
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_SHMTX_H_INCLUDED_
#define _NGX_SHMTX_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    ngx_atomic_t   lock;
#if (NGX_HAVE_POSIX_SEM)
    ngx_atomic_t   wait;
#endif
} ngx_shmtx_sh_t;


typedef struct {
#if (NGX_HAVE_ATOMIC_OPS)
    ngx_atomic_t  *lock;
#if (NGX_HAVE_POSIX_SEM)
    ngx_atomic_t  *wait;
    ngx_uint_t     semaphore;
    sem_t          sem;
#endif
#else
    ngx_fd_t       fd;
    u_char        *name;
#endif
    ngx_uint_t     spin;
} ngx_shmtx_t;


ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr,
    u_char *name);
void ngx_shmtx_destroy(ngx_shmtx_t *mtx);
ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
void ngx_shmtx_lock(ngx_shmtx_t *mtx);
void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid);


#endif /* _NGX_SHMTX_H_INCLUDED_ */