coorection td6

tp/tp6/correc_gr34/ex1.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+
+#define NUM_THREADS 16
+
+void *thread(void *thread_id) {
+    long id = ((long ) thread_id);
+    printf("Hello from thread %ld\n", id);
+
+    return (void*)(2*id);
+}
+
+int main() {
+    pthread_t threads[NUM_THREADS];
+	int t[NUM_THREADS];
+	long res;
+    for (long i = 0; i < NUM_THREADS; i++){
+//		t[i] = i;
+        assert( pthread_create(&threads[i], NULL, thread, (void*)i) == 0);
+	}
+
+    for (int i = 0; i < NUM_THREADS; i++){
+        assert( pthread_join(threads[i],(void *)&res) == 0);
+		printf("%ld\n",res);
+	}
+
+    return EXIT_SUCCESS;
+}

tp/tp6/correc_gr34/sum.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+
+static inline double tstamp(void)
+{
+	struct timespec tv;
+	clock_gettime(CLOCK_MONOTONIC, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+typedef struct arg {
+	long start;
+	long end;
+	long step;
+	long S;
+} arg;
+
+void* slice(void* a) {
+	long start = ((arg*)a)->start;
+	long end = ((arg*)a)->end;
+	long step= ((arg*)a)->step;
+	long S = 0;
+	for(long i = start; i <= end; i += step)
+		S += i;
+	((arg*)a)->S = S;
+	return NULL;
+	//return (void*)S;
+
+}
+
+int main(int argc, char *argv[])
+{
+	long N = strtol(argv[1], NULL,0);
+	long M = strtol(argv[2], NULL,0);
+	long S = 0, ret;
+	double t1,t2;
+	pthread_t* threads = (pthread_t*)calloc(M,sizeof(pthread_t));
+	arg* args = (arg*)calloc(M,sizeof(arg));
+	t1 = tstamp();
+	for (long i = 0; i < M; i++){
+
+		args[i].start = i + 1;
+		args[i].end = N;
+		args[i].step = M;
+
+		assert( pthread_create(&threads[i], NULL, slice, (void*)(args + i)) == 0);
+	}
+
+	for (int i = 0; i < M; i++){
+		//		assert( pthread_join(threads[i], (void*)&ret) == 0);
+		assert( pthread_join(threads[i], NULL) == 0);
+		S += args[i].S;
+	}
+	t2 = tstamp();
+	assert( S == N*(N+1)/2 );
+	printf("S = %ld time = %lf\n",S,t2 - t1);
+
+	return EXIT_SUCCESS;
+}