php扩展多进程共享内存

步骤：
1.运行命令：./ext_skel --extname=sharemem
2.运行命令：./configure --with-php-config=/usr/local/lnmp/php/bin/php-config
3.make clean
make
make install
/usr/local/lnmp/php/sbin/php-fpm restart
/usr/local/lnmp/php/bin/php-cgi /data0/htdocs/blog/sharemem.php
代码如下：
1.config.m4
PHP_ARG_ENABLE(sharemem, whether to enable sharemem support,
Make sure that the comment is aligned:
[  --enable-sharemem           Enable sharemem support])
if test "$PHP_SHAREMEM" != "no"; then
 
  PHP_NEW_EXTENSION(sharemem, sharemem.c, $ext_shared)
fi
2.php_sharemem.h
#ifndef PHP_SHAREMEM_H
#define PHP_SHAREMEM_H
extern zend_module_entry sharemem_module_entry;
#define phpext_sharemem_ptr &sharemem_module_entry
#ifdef PHP_WIN32
#define PHP_SHAREMEM_API __declspec(dllexport)
#else
#define PHP_SHAREMEM_API
#endif
#ifdef ZTS
#include "TSRM.h"
#endif
/*hanhhh*/
#include "sys/mman.h"
#include "fcntl.h"
#include "semaphore.h"
#define FILE_MODE   (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
/*hanhhh*/
typedef struct php_shared_mm {
  sem_t mutex;  /* the mutex: a Posix memory-based semaphore */
  int count;  /* and the counter */
} php_shared_mm;
PHP_MINFO_FUNCTION(sharemem);
PHP_FUNCTION(say8_count_add); /* For testing, remove later. */
PHP_FUNCTION(say8_count_dec); /* For testing, remove later. */
#endif /* PHP_SHAREMEM_H */
3.sharemem.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_sharemem.h"
zend_function_entry sharemem_functions[] = {
 PHP_FE(say8_count_add, NULL)  
 PHP_FE(say8_count_dec, NULL)  
 {NULL, NULL, NULL} /* Must be the last line in sharemem_functions[] */
};
/* }}} */
/* {{{ sharemem_module_entry
 */
zend_module_entry sharemem_module_entry = {
#if