feat: Initial commit

Lab08/ex4.c

@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+sem_t *sems[6];
+
+typedef struct params {
+	int sPrev; 
+	int sNext;
+	int nPrev;
+	int nNext;
+	char * name;
+} *params_t;
+
+void* t_code(void * arg) {
+	params_t p = (params_t) arg;
+	while (1) {
+		for (int i = 0; i < p->nPrev; i++) sem_wait(sems[p->sPrev]);
+		puts(p->name);
+		sleep(3);
+		for (int i = 0; i < p->nNext; i++) sem_post(sems[p->sNext]);
+	}
+	free(p);
+}
+
+pthread_t* start_t(int sPrev, int sNext, int nPrev, int nNext, char * name) {
+	pthread_t *t;
+	params_t p = malloc(sizeof(struct params));
+	p->sPrev = sPrev;
+	p->sNext = sNext;
+	p->nPrev = nPrev;
+	p->nNext = nNext;
+	p->name = name;
+	pthread_create(t, NULL, t_code, (void *) p);
+	return t;
+}
+
+int main() {
+	for (int i = 0; i < 6; i++) {
+		sems[i] = malloc(sizeof(sem_t)); 
+		sem_init(sems[i], 0, 0);
+	}
+	sem_post(sems[0]);
+	start_t(0, 1, 1, 3, "A");
+	start_t(1, 2, 1, 1, "B");
+	start_t(1, 3, 1, 2, "C");
+	start_t(1, 4, 1, 1, "D");
+	start_t(3, 5, 1, 1, "E");
+	start_t(3, 5, 1, 1, "F");
+	start_t(5, 2, 1, 1, "G");
+	start_t(4, 2, 1, 1, "H");
+	start_t(2, 0, 3, 1, "I");
+
+	sleep(24);
+}