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 ZEND_MODULE_API_NO >= 20010901
 STANDARD_MODULE_HEADER,
#endif
 "sharemem",
 sharemem_functions,
 NULL,
 NULL,
 NULL,  /* Replace with NULL if there's nothing to do at request start */
 NULL, /* Replace with NULL if there's nothing to do at request end */
 PHP_MINFO(sharemem),
#if ZEND_MODULE_API_NO >= 20010901
 "0.1", /* Replace with version number for your extension */
#endif
 STANDARD_MODULE_PROPERTIES
};
/* }}} */

#ifdef COMPILE_DL_SHAREMEM
ZEND_GET_MODULE(sharemem)
#endif

/* {{{ PHP_MINFO_FUNCTION
 */
PHP_MINFO_FUNCTION(sharemem)
{
 php_info_print_table_start();
 php_info_print_table_header(2, "sharemem support", "enabled");
 php_info_print_table_end();

}
/* }}} */

 

PHP_FUNCTION(say8_count_add){
  int  fd;
  struct php_shared_mm  *ptr;

  fd = open("/tmp/xx", O_RDWR, FILE_MODE);
  if(fd < 0)
  {  
   fd = open("/tmp/xx", O_RDWR|O_CREAT, FILE_MODE);
   assert(fd > 0);
   ftruncate(fd, sizeof(struct php_shared_mm));
   //write(fd, &php_shared_mm, sizeof(struct php_shared_mm));
  }  
  ptr =(struct php_shared_mm *) mmap(NULL, sizeof(struct php_shared_mm), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
  
  close(fd);
  assert(sem_init(&ptr->mutex, 1, 1) == 0);
  setbuf(stdout, NULL);

  assert(sem_wait(&ptr->mutex) >=0 );
   ptr->count++;
     // printf ( "%d/n", ptr->count );
  assert(sem_post(&ptr->mutex) >=0 );
     // usleep(90000);

  RETURN_LONG(ptr->count);
   
    RETURN_TRUE;
}

 

PHP_FUNCTION(say8_count_dec){

  int  fd;
  struct php_shared_mm  *ptr;

  fd = open("/tmp/xx", O_RDWR, FILE_MODE);
  if(fd < 0)
  {  
   fd = open("/tmp/xx", O_RDWR|O_CREAT, FILE_MODE);
   assert(fd > 0);
   ftruncate(fd, sizeof(struct php_shared_mm));
   //write(fd, &php_shared_mm, sizeof(struct php_shared_mm));
  }  
  ptr =(struct php_shared_mm *) mmap(NULL, sizeof(struct php_shared_mm), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
  
  close(fd);
  assert(sem_init(&ptr->mutex, 1, 1) == 0);
  setbuf(stdout, NULL);

  assert(sem_wait(&ptr->mutex) >=0 );
   ptr->count--;
     // printf ( "%d/n", ptr->count );
  assert(sem_post(&ptr->mutex) >=0 );
     // usleep(90000);

  RETURN_LONG(ptr->count);
   
    RETURN_TRUE;

}