#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdint.h>
#include <inttypes.h>
typedef struct tmp_num{
int tmp_1;
int tmp_2;
}t_num;
/* Dichiarazione prototipi secondo le direttive di pthread */
void *num_mezzo_1(void *num_orig);
void *num_mezzo_2(void *num_orig);
int main(int argc, char *argv[]){
/* Inizializzo i 2 thread */
pthread_t thread1, thread2;
int tmp=0,rc1,rc2,num;
t_num main_tnum;
num=atoi(argv[1]);
if(num <= 3){
printf("Questo è un numero primo: %d\n", num);
exit(0);
}
if( (rc1=pthread_create( &thread1, NULL, &num_mezzo_1, (void *)num)) ){
printf("Creazione del thread fallita: %d\n", rc1);
exit(1);
}
if( (rc2=pthread_create( &thread2, NULL, &num_mezzo_2, (void *)num)) ){
printf("Creazione del thread fallita: %d\n", rc2);
exit(1);
}
main_tnum.tmp_1 = 0;
main_tnum.tmp_2 = 0;
pthread_join(thread1, (void **)&(main_tnum.tmp_1));
pthread_join(thread2, (void **)&(main_tnum.tmp_2));
tmp=main_tnum.tmp_1+main_tnum.tmp_2;
if(tmp>2){
printf("Questo NON è un numero primo: %d\n", num);
}
else{
printf("Questo è un numero primo: %d\n", num);
}
exit(0);
}
void *num_mezzo_1(void *num_orig){
t_num p1_tnum;
int cont_1;
int n_orig=(int)num_orig;
p1_tnum.tmp_1 = 0;
for(cont_1=1; cont_1<=(n_orig/2); cont_1++){
if((n_orig % cont_1) == 0){
(p1_tnum.tmp_1)++;
}
}
pthread_exit((void *)(p1_tnum.tmp_1));
return NULL;
}
void *num_mezzo_2(void *num_orig){
t_num p2_tnum;
int cont_2;
int n_orig=(int)num_orig;
p2_tnum.tmp_2 = 0;
for(cont_2=((n_orig/2)+1); cont_2<=n_orig; cont_2++){
if((n_orig % cont_2) == 0){
(p2_tnum.tmp_2)++;
}
}
pthread_exit((void *)(p2_tnum.tmp_2));
return NULL;
}
私は Debian Sid 64 ビットを使用していますが、私が開発したこの単純なプログラムに問題があります。
でコンパイルすると、clang -Wall -Wextra -o test prime.c -lpthread
警告が 1 つだけ (未使用の argc ) になり、プログラムは正常に実行されます。
しかし、GCC-4.7.2 ( gcc -Wall -Wextra -o test prime.c -lpthread
)でコンパイルすると、さらに警告が表示され (未使用の argc +ポインターから異なるサイズの整数へのさまざまなキャスト)、プログラムは SegFault で失敗します。
なぜclangでは機能し、GCCでは機能しないのかわかりません。
編集:
num_primo_pthread.c: In function ‘main’:
num_primo_pthread.c:33:57: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
num_primo_pthread.c:37:57: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
num_primo_pthread.c:16:14: warning: unused parameter ‘argc’ [-Wunused-parameter]
num_primo_pthread.c: In function ‘num_mezzo_1’:
num_primo_pthread.c:61:13: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
num_primo_pthread.c:68:15: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
num_primo_pthread.c: In function ‘num_mezzo_2’:
num_primo_pthread.c:75:13: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
num_primo_pthread.c:82:15: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]