501-nginx源码编译测试内存池接口函数功能

蔚落 2022-09-09 04:49 152阅读 0赞

## 测试代码 ##

#include <ngx_config.h>
    #include <nginx.h>
    #include <ngx_core.h>
    #include <ngx_palloc.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    
    void ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
                const char *fmt, ...)
    {
        
    
    }
    
    typedef struct Data stData;
    struct Data
    {
        
        char *ptr;
        FILE *pfile;
    };
    
    void func1(char *p)
    {
        
        printf("free ptr mem!");
        free(p);
    }
    void func2(FILE *pf)
    {
        
        printf("close file!");
        fclose(pf);
    }
    void main()
    {
        
    	//512 - sizeof(ngx_pool_t) - 4095   =>   max
        ngx_pool_t *pool = ngx_create_pool(512, NULL);
        if(pool == NULL)
        {
        
            printf("ngx_create_pool fail...");
            return;
        }
    
        void *p1 = ngx_palloc(pool, 128);//从小块内存池分配的
        if(p1 == NULL)
        {
        
            printf("ngx_palloc 128 bytes fail...");
            return;
        }
    
        stData *p2 = ngx_palloc(pool, 512);//从大块内存池分配的
        if(p2 == NULL)
        {
        
            printf("ngx_palloc 512 bytes fail...");
            return;
        }
        p2->ptr = malloc(12);
        strcpy(p2->ptr, "hello world");
        p2->pfile = fopen("data.txt", "w");
        
        ngx_pool_cleanup_t *c1 = ngx_pool_cleanup_add(pool, sizeof(char*));
        c1->handler = func1;
        c1->data = p2->ptr;
    
        ngx_pool_cleanup_t *c2 = ngx_pool_cleanup_add(pool, sizeof(FILE*));
        c2->handler = func2;
        c2->data = p2->pfile;
    
        ngx_destroy_pool(pool);//1.调用所有的预置的清理函数 2.释放大块内存 3.释放小块内存池所有内存
    
        return;
    }

**示意图如下**  
![在这里插入图片描述][c8756950848148b5ad2a0473532b28ff.png]

## 关于nginx的安装，见我另外一篇博客 ##

![在这里插入图片描述][bd34a19baf06400ca211a0b94704e777.png]

## nginx代码编译 ##

gcc -c -g -I src/core -I src/event -I src/event/modules -I 
    src/os/unix -I objs -I src/http -I src/http/modules -o 
    ngx_testpool.o  ngx_testpool.c
    
    
    gcc -o ngx_testpool ngx_testpool.o objs/src/core/ngx_palloc.o 
    objs/src/os/unix/ngx_alloc.o

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 1]

[c8756950848148b5ad2a0473532b28ff.png]: /images/20220829/899f9714940c4546818a6a5529222829.png
[bd34a19baf06400ca211a0b94704e777.png]: /images/20220829/20a389fc8e5d4c2c80a1ddeb6081ff03.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/57705e3ebd6c4ec0aaf1f6a8a8a908dc.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBALeael-azveWuhw_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220829/2b481bd6fc744dcf81fa6d98288e1e0d.png