Mercurial > hg > nginx
annotate src/os/unix/ngx_shmem.h @ 3440:88741ec7731a stable-0.7
merge r3294, r3305:
Fix a bug introduced in r2032: After a child process has read a terminate
message from a channel, the process tries to read the channel again.
The kernel (at least FreeBSD) may preempt the process and sends a SIGIO
signal to a master process. The master process sends a new terminate message,
the kernel switches again to the the child process, and the child process
reads the messages instead of an EAGAIN error. And this may repeat over
and over. Being that the child process can not exit the cycle and test
the termination flag set by the message handler.
The fix disallow the master process to send a new terminate message on
SIGIO signal reception. It may send the message only on SIGALARM signal.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 01 Feb 2010 15:49:36 +0000 |
parents | b3b8c66bd520 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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5 |
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696 | 7 #ifndef _NGX_SHMEM_H_INCLUDED_ |
8 #define _NGX_SHMEM_H_INCLUDED_ | |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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14 |
605 | 15 typedef struct { |
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16 u_char *addr; |
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17 size_t size; |
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18 ngx_str_t name; |
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19 ngx_log_t *log; |
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20 ngx_uint_t exists; /* unsigned exists:1; */ |
605 | 21 } ngx_shm_t; |
22 | |
23 | |
24 ngx_int_t ngx_shm_alloc(ngx_shm_t *shm); | |
25 void ngx_shm_free(ngx_shm_t *shm); | |
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27 |
696 | 28 #endif /* _NGX_SHMEM_H_INCLUDED_ */ |