資源類型在內核中的結構php
//zend_list.h typedef struct _zend_rsrc_list_entry { void *ptr; int type; int refcount; } zend_rsrc_list_entry;
資源類型的使用mysql
int le_hello_person; //定義一個全局變量,保存建立的資源類型 #define PHP_HELLO_PERSON_RES_NAME "Person Data" //資源類型名稱 le_hello_person = zend_register_list_destructors_ex(NULL, NULL, PHP_HELLO_PERSON_RES_NAME, module_number);//資源類型的建立
參數說明:
1,普通資源的析構函數
2,長久資源的析構函數
3,資源的名稱
4,固定寫法
//資源類型的建立必須在MINIT階段,因此是這樣的
PHP_MINIT_FUNCTION(myext)
{
le_hello_person = zend_register_list_destructors_ex(NULL, NULL, PHP_HELLO_PERSON_RES_NAME, module_number);
return SUCCESS;
}sql
代碼示例函數
//建立一個結構體,保存在資源裏 typedef struct _php_hello_person { char *name; int name_len; long age; } php_hello_person;//php_myext.h //三個函數申明php_myext.h PHP_MINIT_FUNCTION(myext); PHP_FUNCTION(myext_example_resource_new);// PHP_FUNCTION(myext_example_resource_use);// #define PHP_HELLO_PERSON_RES_NAME "Person Data" int le_hello_person;//php_myext.h PHP_FE(myext_example_resource_new, NULL)//每一個函數一行,第一個參數與PHP_FUNCTION(name)的name同樣 PHP_FE(myext_example_resource_use, NULL)//每一個函數一行,第一個參數與PHP_FUNCTION(name)的name同樣 //增長MINIT函數 zend_module_entry myext_module_entry = { #if ZEND_MODULE_API_NO >= 20010901 STANDARD_MODULE_HEADER, #endif "myext",//擴展名稱 myext_functions,//zend_function_entry myext_functions 定義好的函數擴展變量 PHP_MINIT(myext),//MINIT_FUNCTION,把默認的NULL替換成PHP_MINIT(myext) NULL,//MSHUTDOWN_FUNCTION NULL,//RINIT_FUNCTION NULL,//RSHUTDOWN_FUNCTION NULL,//MINFO_FUNCTION #if ZEND_MODULE_API_NO >= 20010901 PHP_MYEXT_VERSION, #endif STANDARD_MODULE_PROPERTIES }; PHP_MINIT_FUNCTION(myext) { le_hello_person = zend_register_list_destructors_ex(NULL, NULL, PHP_HELLO_PERSON_RES_NAME, module_number); return SUCCESS; } //建立資源的函數 PHP_FUNCTION(myext_example_resource_new) { php_hello_person *person; char *name; int name_len; long age; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sl", &name, &name_len, &age) == FAILURE) { RETURN_FALSE; } if (name_len < 1) { php_error_docref(NULL TSRMLS_CC, E_WARNING, "No name given, person resource not created."); RETURN_FALSE; } if (age < 0 || age > 255) { php_error_docref(NULL TSRMLS_CC, E_WARNING, "Nonsense age (%d) given, person resource not created.", age); RETURN_FALSE; } person = emalloc(sizeof(php_hello_person)); person->name = estrndup(name, name_len); person->name_len = name_len; person->age = age; ZEND_REGISTER_RESOURCE(return_value, person, le_hello_person); } //使用資源的函數 PHP_FUNCTION(myext_example_resource_use) { php_hello_person *person; zval *zperson; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &zperson) == FAILURE) { RETURN_FALSE; } ZEND_FETCH_RESOURCE(person, php_hello_person*, &zperson, -1, PHP_HELLO_PERSON_RES_NAME, le_hello_person); php_printf("Hello "); PHPWRITE(person->name, person->name_len); php_printf("!According to my records, you are %d years old.", person->age); RETURN_TRUE; }
$resource = myext_example_resource_new('zhangxiaomin',31);
myext_example_resource_use($resource);
//結果輸出
Hello zhangxiaomin!According to my records, you are 31 years old.
/home/zhangxiaomin/study/php-5.6.27/ext/myext/myext.c(223) : Freeing 0x7F1763CF76B8 (24 bytes), script=/data1/home/zhangxiaomin/study/php-5.6.27/ext/myext/test.php 內存泄漏
在剛纔的代碼中,咱們註冊了一個本身的資源類型,實現了在函數調用中,返回資源類型,而後使用它,可是結果中報了內存泄漏,如今咱們增長一個析構函數,處理這個問題。fetch
//增長一個析構函數,一般用來釋放資源 static void php_hello_person_dtor(zend_rsrc_list_entry *rsrc TSRMLS_DC) { php_hello_person *person = (php_hello_person*)rsrc->ptr; if (person) { if (person->name) { efree(person->name); } efree(person); } } PHP_MINIT_FUNCTION(myext) { le_hello_person = zend_register_list_destructors_ex(php_hello_person_dtor, NULL, PHP_HELLO_PERSON_RES_NAME, module_number);//把默認的NULL,改爲php_hello_person_dtor return SUCCESS; }
咱們來看一下,當須要使用資源時,用了一個宏來獲取this
//zend_list.h #define ZEND_FETCH_RESOURCE(rsrc, rsrc_type, passed_id, default_id, resource_type_name, resource_type) \ rsrc = (rsrc_type) zend_fetch_resource(passed_id TSRMLS_CC, default_id, resource_type_name, NULL, 1, resource_type); \ ZEND_VERIFY_RESOURCE(rsrc); #define ZEND_VERIFY_RESOURCE(rsrc) \ if (!rsrc) { \ RETURN_FALSE; \ } zend_fetch_resource()是對zend_hash_find()的一層封裝,它使用一個數字Key去一個專門保存資源的HashTable中查找咱們須要的資源數據。找到以後,接着對它作了一個校驗。 參數說明: 1,實際存儲資源的類型變量 2,類型 3,存儲資源的zval變量 4,-1 5,資源類型名稱 6,資源類型數據 ZEND_FETCH_RESOURCE(person, php_hello_person*, &zperson, -1, PHP_HELLO_PERSON_RES_NAME, le_hello_person);
等價於
int rsyc_type;//rsyc_type會等於le_hello_person
person = (php_hello_person *)zend_list_find(Z_RESVAL_P(zperson),&rsrc_type);
雖然上面咱們建立了析構函數,可是不少場景下,咱們須要手動即便釋放資源,因此跟建立想對應須要有一個類型是close的資源釋放函數spa
PHP_FUNCTION(myext_example_resource_close) { php_hello_person *person; zval *zperson; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &zperson) == FAILURE) { RETURN_FALSE; } zend_hash_index_del(&EG(regular_list),Z_RESVAL_P(zperson)); RETURN_TRUE; }
有時候咱們但願可以保持一個長久的資源,避免不斷的分配開銷,類型與mysql_pconnect(),申請長資源和普通資源的步驟相似,咱們來看下面的代碼code
int le_hello_person_persist;
static void php_hello_person_persist_dtor(zend_rsrc_list_entry *rsrc TSRMLS_DC) { php_hello_person *person = (php_hello_person*)rsrc->ptr; if (person) { if (person->name) { pefree(person->name, 1); } pefree(person, 1); } } //在MINIT函數中 le_hello_person_persist = zend_register_list_destructors_ex (NULL, php_hello_person_persist_dtor, PHP_HELLO_PERSON_RES_NAME, module_number);//這時把析構函數放在第二個參數上 PHP_FUNCTION(myext_example_resource_pnew) { php_hello_person *person; char *name; int name_len; long age; int key_len; char *key; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sl", &name, &name_len, &age) == FAILURE) { RETURN_FALSE; } if (name_len < 1) { php_error_docref(NULL TSRMLS_CC, E_WARNING, "No name given, person resource not created."); RETURN_FALSE; } if (age < 0 || age > 255) { php_error_docref(NULL TSRMLS_CC, E_WARNING, "Nonsense age (%d) given, person resource not created.", age); RETURN_FALSE; } zend_rsrc_list_entry *le; /* Look for an established resource */ key_len = spprintf(&key, 0, "hello_person_%s_%d", name, age); if (zend_hash_find(&EG(persistent_list), key, key_len + 1, &le) == SUCCESS) {//從哈希表裏獲取以前寫入的數據,第一次這裏則爲空 /* An entry for this person already exists */ ZEND_REGISTER_RESOURCE(return_value, le->ptr, le_hello_person_persist); efree(key); return; } /* New person, allocate a structure */ person = pemalloc(sizeof(php_hello_person), 1); person->name = pemalloc(name_len + 1, 1); memcpy(person->name, name, name_len + 1); person->name_len = name_len; person->age = age; ZEND_REGISTER_RESOURCE(return_value, person, le_hello_person_persist); /* Store a reference in the persistence list */ zend_rsrc_list_entry new_le; new_le.ptr = person; new_le.type = le_hello_person_persist; zend_hash_add(&EG(persistent_list), key, key_len + 1, &new_le, sizeof(zend_rsrc_list_entry), NULL);//保存數據到哈希表裏,下一次直接獲取 efree(key); } //咱們須要修改一下,調用的函數,讓它能夠同時處理兩個類型的資源,只須要改ZEND_FETCH_RESOURCE部分就能夠了 PHP_FUNCTION(myext_example_resource_use) { php_hello_person *person; zval *zperson; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &zperson) == FAILURE) { RETURN_FALSE; } if(Z_TYPE_P(zperson) != IS_RESOURCE){ php_printf("參數不是資源類型"); RETURN_FALSE; } //ZEND_FETCH_RESOURCE(person, php_hello_person*, &zperson, -1, PHP_HELLO_PERSON_RES_NAME, le_hello_person);獲取type爲le_hello_person的資源 ZEND_FETCH_RESOURCE2(person, php_hello_person*, &zperson, -1, PHP_HELLO_PERSON_RES_NAME, le_hello_person,le_hello_person_persist);//獲取type爲le_heel_person 或 le_hello_person_persist的資源 php_printf("Hello "); PHPWRITE(person->name, person->name_len); php_printf("!According to my records, you are %d years old.", person->age); /* int rsrc_type; person = (php_hello_person *)zend_list_find(Z_RESVAL_P(zperson),&rsrc_type); if(!person || rsrc_type != le_hello_person){ php_printf("zend_list_find error"); } php_printf("\nfrom zend_list_find Hello "); PHPWRITE(person->name, person->name_len); php_printf("!According to my records, you are %d years old.", person->age); */ RETURN_TRUE; }