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view src/core/ngx_shmtx.h @ 7978:2ca57257252d

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Core: fixed ngx_pcre_studies cleanup. If a configuration parsing fails for some reason, ngx_regex_module_init() is not called, and ngx_pcre_studies remained set despite the fact that the pool it was allocated from is already freed. This might result in a segmentation fault during runtime regular expression compilation, such as in SSI, for example, in the single process mode, or if a worker process died and was respawned from a master process in such an inconsistent state. Fix is to clear ngx_pcre_studies from the pool cleanup handler (which is anyway used to free JIT-compiled patterns).
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 25 Dec 2021 01:07:10 +0300
parents 512c741fa841
children
line wrap: on
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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_ */