使用riscv64-unknown-elf-gcc编译多线程程序的编译错误

Question

/* Includes */
#include <unistd.h>     /* Symbolic Constants */
#include <sys/types.h>  /* Primitive System Data Types */ 
#include <errno.h>      /* Errors */
#include <stdio.h>      /* Input/Output */
#include <stdlib.h>     /* General Utilities */
#include <pthread.h>    /* POSIX Threads */
#include <string.h>     /* String handling */

/* prototype for thread routine */
void print_message_function ( void *ptr );

/* struct to hold data to be passed to a thread
   this shows how multiple data items can be passed to a thread */
typedef struct str_thdata
{
    int thread_no;
    char message[100];
} thdata;

int main()
{
    pthread_t thread1, thread2;  /* thread variables */
    thdata data1, data2;         /* structs to be passed to threads */

    /* initialize data to pass to thread 1 */
    data1.thread_no = 1;
    strcpy(data1.message, "Hello!");

    /* initialize data to pass to thread 2 */
    data2.thread_no = 2;
    strcpy(data2.message, "Hi!");

    /* create threads 1 and 2 */    
    pthread_create (&thread1, NULL, (void *) &print_message_function, (void *) &data1);
    pthread_create (&thread2, NULL, (void *) &print_message_function, (void *) &data2);

    /* Main block now waits for both threads to terminate, before it exits
       If main block exits, both threads exit, even if the threads have not
       finished their work */ 
    pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);

    /* exit */  
    exit(0);
} /* main() */

/**
 * print_message_function is used as the start routine for the threads used
 * it accepts a void pointer 
**/
void print_message_function ( void *ptr )
{
    thdata *data;            
    data = (thdata *) ptr;  /* type cast to a pointer to thdata */

    /* do the work */
    printf("Thread %d says %s \n", data->thread_no, data->message);

    pthread_exit(0); /* exit */
} /* print_message_function ( void *ptr ) */

我遇到的错误是 thread-ex.c:24:5: 错误：未知类型名称 'pthread_t' pthread_t线程1，线程2； /* 线程变量 */ ^ thread-ex.c:36:5: 警告：函数的隐式声明 'pthread_create' [-Wimplicit-function-declaration] pthread_create (&thread1, NULL, (void *) &print_message_function, (void ) &data1); ^ thread-ex.c:42:5: 警告：函数的隐式声明 'pthread_join' [-Wimplicit-function-declaration] pthread_join(thread1, NULL); ^ thread-ex.c：在函数'print_message_function'中： thread-ex.c:61:5: 警告：函数的隐式声明 'pthread_exit' [-Wimplicit-function-declaration] pthread_exit(0); / 退出 */

Answer 1

pthreads 不适用于基于 newlib 的 RISC-V 编译器。您将需要使用基于 linux 的 RISC-V 编译器 (riscv64-unknown-linux-gnu-gcc)。您可以在同一 riscv-gcc 存储库 (https://github.com/riscv/riscv-gnu-toolchain) 中找到构建和安装基于 linux 的编译器的说明。

使用riscv64-unknown-elf-gcc编译多线程程序的编译错误

Compilation error for multi threaded programs compiled using riscv64-unknown-elf-gcc

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