LINUX多執行緒程式設計

#include #include #include #define theard_number 3
#define repeat_number 5
#define delay_time_levels 10.0
void *thrd_func(void *arg){
int thrd_num=(int)arg;
int delay_time=0;
int count=0;
printf("theard %d is starting\n",thrd_num );
for(count=0;count這裡主函式第乙個for迴圈pthread()的最後乙個引數可能不同版本的linux寫法上會有所不同，我的是ubuntu14.04,要寫成&no，red hat下可以寫為（void*)
**編寫沒有問題，但是在gcc 編譯的時候會報錯
# gcc thread.c
thread.c: in function 『thrd_func』:
thread.c:9:15: warning: cast from pointer to integer of different size [-wpointer-to-int-cast]
int thrd_num=(int)arg;
^/tmp/cc3y8dex.o：在函式『main』中：
thread.c:(.text+0xff)：對『pthread_create』未定義的引用
thread.c:(.text+0x163)：對『pthread_join』未定義的引用
collect2: error: ld returned 1 exit status

網上找到了原因，原來pthread不是linux的預設庫中的檔案，所以無法直接使用,需要在後面加上-lpthread

# gcc thread.c -o test -lpthread
thread.c: in function 『thrd_func』:
thread.c:9:15: warning: cast from pointer to integer of different size [-wpointer-to-int-cast]
int thrd_num=(int)arg;
^

這裡出現乙個警告也沒關係，編譯能夠通過就行，具體什麼原因我也不知道。

執行test檔案即可得到結果

./test create threads success waiting for threads to finish...... theard 878785664 is starting theard 878785664 is starting theard 878785664 is starting threard 878785664 : job 0 delay = 5 threard 878785664 : job 0 delay = 10 threard 878785664 : job 0 delay = 10 threard 878785664 : job 1 delay = 4 threard 878785664 : job 1 delay = 10 threard 878785664 : job 1 delay = 6 threard 878785664 : job 2 delay = 2 threard 878785664 : job 2 delay = 5 threard 878785664 : job 3 delay = 4 threard 878785664 : job 2 delay = 6 threard 878785664 : job 3 delay = 4 threard 878785664 : job 4 delay = 4 theard 878785664 finished threard 878785664 : job 3 delay = 7 threard 878785664 : job 4 delay = 8 theard 878785664 finished theard 0 joined theard 1 joined threard 878785664 : job 4 delay = 6 theard 878785664 finished

theard 2 joined

LINUX多執行緒程式設計

Linux 多執行緒程式設計

Linux多執行緒程式設計

linux 多執行緒程式設計

LINUX多執行緒程式設計

Linux 多執行緒程式設計

Linux多執行緒程式設計

linux 多執行緒程式設計

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