Pthreads編譯不起作用

我寫了一些代碼，但它編譯時似乎不工作。我試圖在Ubuntu上運行此：Pthreads編譯不起作用

#include <pthread.h> 
#include <ctype.h> 
#include <unistd.h> 

char buffer[128]; 

void *write_thread(void *args) 
{ 
    int count = *((int*)args); 
    write(STDOUT_FILENO, buffer, count); 

    pthread_exit(0); 
} 

void *toupper_thread(void *args) 
{ 
    int i; 
    int count = *((int*)args); 
    for(i = 0; i < count; i++) { 
     buffer[i] = toupper(buffer[i]); 
    } 

    pthread_t writeId; 
    pthread_create(&writeId, NULL, write_thread, &count); 

    pthread_join(writeId, NULL); 
    pthread_exit(0); 
} 

void *read_thread(void *args) 
{ 
    int count = read(STDIN_FILENO, buffer, 128); 
    pthread_t toupperId; 
    pthread_create(&toupperId, NULL, toupper_thread, &count); 

    pthread_join(toupperId, NULL); 
    //buffer[count] = 0; 

    pthread_exit(0); 

} 

int main() 
{ 
    pthread_t threadId; 
    pthread_create(&threadId, NULL, read_thread, NULL); 

    pthread_join(threadId, NULL); 
}

，當我嘗試用gcc -pthread prob41.c或gcc prob41.c -lpthread編譯它，我得到這些錯誤：

prob41.c:1:21: error: pthread.h: No such file or directory 
    prob41.c: In function ‘toupper_thread’: 
    prob41.c:23: error: ‘pthread_t’ undeclared (first use in this function) 
    prob41.c:23: error: (Each undeclared identifier is reported only once 
    prob41.c:23: error: for each function it appears in.) 
    prob41.c:23: error: expected ‘;’ before ‘writeId’ 
    prob41.c:24: error: ‘writeId’ undeclared (first use in this function) 
    prob41.c: In function ‘read_thread’: 
    prob41.c:33: error: ‘pthread_t’ undeclared (first use in this function) 
    prob41.c:33: error: expected ‘;’ before ‘toupperId’ 
    prob41.c:34: error: ‘toupperId’ undeclared (first use in this function) 
    prob41.c: In function ‘main’: 
    prob41.c:45: error: ‘pthread_t’ undeclared (first use in this function) 
    prob41.c:45: error: expected ‘;’ before ‘threadId’ 
    prob41.c:46: error: ‘threadId’ undeclared (first use in this function)

我不知道我在做什麼錯誤。

來源

2012-02-06 Lara

有你的libc6-dev的安裝？ – rekire 2012-02-06 22:14:56

需要在編譯命令加上-I標誌，以使編譯器能夠找到pthread.h

來源

2012-02-06 22:13:28

他寫了這個「gcc prob41.c -lpthread」，裏面有'-l'。 – rekire 2012-02-06 22:18:12

這是一個首都，不只是-l國旗！ – 2012-02-07 07:17:40

看來你錯過了一些依賴。

試試這個：

$ sudo apt-get install -y libc6-dev

來源

2012-02-06 22:15:53 rekire

我試過了，結果如下：升級0次，新安裝0次，刪除0次，未升級33次。 – Lara 2012-02-06 22:32:02

試試這個：sudo apt-get install build-essential – rekire 2012-02-06 22:35:14

仍然不起作用，同樣的錯誤 – Lara 2012-02-06 22:38:31

您不必在系統中的pthread.h庫。嘗試安裝適合它的庫。
你需要確保使用#include <sys/type.h>
不要忘記添加-lpthread在編譯：gcc -lpthread {x}.c -o {y}

來源

2016-12-13 00:37:50

Pthreads編譯不起作用

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