This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.
Closed 11 years ago.
我打算用多线转换两个文件。 但下面的程序让我分解错误。
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
void *a_to_temp( void *filea);
void copyFile( FILE *in, FILE *out );
void *temp_to_b( void *fileb);
void *b_to_a(void *ab);
struct files{
char a[80];
char b[80];
} ab;
pthread_mutex_t temptob = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t btoa = PTHREAD_MUTEX_INITIALIZER;
main(int argc, char **argv)
{
fprintf(stderr, "in main");
pthread_t thread1, thread2, thread3;
strcpy( ab.a, argv[1]);
strcpy(ab.b, argv[2]);
int iret1, iret2, iret3;
pthread_mutex_lock( &temptob );
pthread_mutex_lock( &btoa );
iret1 = pthread_create( &thread1, NULL, a_to_temp, (void*) &argv[1]);
iret2 = pthread_create( &thread2, NULL, b_to_a, (void*) &ab);
iret3 = pthread_create( &thread3, NULL, temp_to_b, (void*) &argv[2]);
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
pthread_join( thread3, NULL);
exit(0);
}
void *a_to_temp( void *filea) {
FILE *a = fopen((char *)filea, "r");
FILE *f = fopen( "temp", "w");
copyFile( a , f);
fclose(f);
fclose( a);
pthread_mutex_unlock( &temptob );
}
void *temp_to_b( void *fileb) {
pthread_mutex_lock( &temptob );
FILE *b = fopen((char *)fileb, "r");
FILE *f = fopen( "temp", "r");
copyFile( f, b);
fclose(f);
pthread_mutex_unlock( &btoa );
}
void *b_to_a(void *ab) {
pthread_mutex_lock( &btoa );
FILE *a = fopen(((struct files *) ab)->a, "w"); //
FILE *b = fopen(((struct files *) ab)->b, "r");//
fprintf(stderr, "c files opened");
copyFile( b, a);
fclose(a);
fclose(b);
}
void copyFile( FILE *in, FILE *out) {
char ch;
while(!feof(in)) {
ch = getc(in);
if(!feof(in)) putc(ch, out);
}
}
我通过打印值测试了代码直到主函数结束。 我猜错误应该位于函数之一之内。