linux 多线程 写日志

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;

void write_log(const char* message) {
    pthread_mutex_lock(&log_mutex);
    FILE* log_file = fopen("app.log", "a");
    if (log_file != NULL) {
        fprintf(log_file, "%s\n", message);
        fclose(log_file);
    }
    pthread_mutex_unlock(&log_mutex);
}

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>

#define BUFFER_SIZE 1024
char log_buffer[BUFFER_SIZE];
int buffer_index = 0;

pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;

void write_log(const char* message) {
    pthread_mutex_lock(&log_mutex);
    int len = strlen(message);
    if (buffer_index + len >= BUFFER_SIZE) {
        FILE* log_file = fopen("app.log", "a");
        if (log_file != NULL) {
            fwrite(log_buffer, 1, buffer_index, log_file);
            fclose(log_file);
            buffer_index = 0;
        }
    }
    memcpy(log_buffer + buffer_index, message, len);
    buffer_index += len;
    pthread_mutex_unlock(&log_mutex);
}