C/C++编程：准确获取多线程序运行时间

浅浅的花香味﹌ 2022-12-28 06:27 159阅读 0赞

1、acl\_meter\_time.c

#include <lzma.h>
    #include <zconf.h>
    #include <pthread.h>
    #include <malloc.h>
    #include <sys/time.h>
    
    static void free_tls(void *ptr)
    {
        
        free(ptr);
    }
    
    static pthread_key_t  once_key;
    static void once_init(void){
        
        pthread_key_create(&once_key, free_tls);
    }
    static pthread_once_t once_control = PTHREAD_ONCE_INIT;
    static void *tls_calloc(size_t len){
        
        void *ptr;
    
        pthread_once(&once_control, once_init);
        ptr = pthread_getspecific(once_key);
        if(ptr == NULL){
        
            ptr = calloc(1, len);
            pthread_setspecific(once_key, ptr);
        }
        return ptr;
    }
    
    typedef struct {
        
        struct timeval stamp;
        int   init_done;
    } METER_CTX_T;
    double acl_meter_time(const char *filename, int line, const char *info){
        
        struct timeval now;
        double  f;
        METER_CTX_T *ctx = tls_calloc(sizeof(METER_CTX_T));
    
        if(ctx->init_done == 0){
        
            ctx->init_done = 1;
            gettimeofday(&ctx->stamp, NULL);
        }
    
        gettimeofday(&now, NULL);
        now.tv_usec -= ctx->stamp.tv_usec;
        if (now.tv_usec < 0) {
        
            --now.tv_sec;
            now.tv_usec += 1000000;
        }
        now.tv_sec -= ctx->stamp.tv_sec;
    
        f = now.tv_sec * 1000.0 + now.tv_usec/1000.0;
        if (info)
            printf("tid=%lu, %s(%d), %s: time inter = %8.3f ms\r\n",
                   (unsigned long) pthread_self(), filename, line, info, f);
        else
            printf("tid=%lu, %s(%d): time inter = %8.3f ms\r\n",
                   (unsigned long) pthread_self(), filename, line, f);
    
        gettimeofday(&ctx->stamp, NULL);
        return (f);
    }

2、acl\_meter\_time.h

#pragma once
    
    
    double acl_meter_time(const char *filename, int line, const char *info);
    
    #define	ACL_METER_TIME(info)	acl_meter_time(__FILE__, __LINE__, info)

3、如何使用

#include <stdio.h>
    #include <sys/time.h>
    #include <zconf.h>
    #include <pthread.h>
    #include "stdlib.h"
    
    
    #include "acl_meter_time.h"
    
    void *thr_fn1(void *arg)
    {
        
        ACL_METER_TIME(NULL);
        usleep(1000);
        ACL_METER_TIME(NULL);
        printf("thread 1 returning\n");
        return((void *)1);
    }
    
    int main(void)
    {
        
        ACL_METER_TIME(NULL);
        int			err;
        pthread_t	tid1, tid2;
        void		*tret;
        err = pthread_create(&tid1, NULL, thr_fn1, NULL);
        if (err != 0){
        
            fprintf(stderr, "can't create thread 1");
            exit(err);
        }
        err = pthread_join(tid1, &tret);
        if (err != 0){
        
            fprintf(stderr, "can't join with thread 1");
            exit(err);
        }
    
    
        usleep(1000);
        ACL_METER_TIME(NULL);
    
    
        return 0;
    }

![在这里插入图片描述][20201215102156994.png]

[20201215102156994.png]: /images/20221120/a91c0b13ae3f4f63aa09f79df3fe62fe.png