Start several threads
suggest change#include <stdio.h> #include <threads.h> #include <stdlib.h> struct my_thread_data { double factor; }; int my_thread_func(void* a) { struct my_thread_data* d = a; // do something with d printf("we found %g\n", d->factor); // return an success or error code return d->factor > 1.0; }
int main(int argc, char* argv[argc+1]) { unsigned n = 4; if (argc > 1) n = strtoull(argv[1], 0, 0); // reserve space for the arguments for the threads struct my_thread_data D[n]; // can't be initialized for (unsigned i = 0; i < n; ++i) { D[i] = (struct my_thread_data){ .factor = 0.5*i, }; } // reserve space for the ID's of the threads thrd_t id[4]; // launch the threads for (unsigned i = 0; i < n; ++i) { thrd_create(&id[i], my_thread_func, &D[i]); } // Wait that all threads have finished, but throw away their // return values for (unsigned i = 0; i < n; ++i) { thrd_join(id[i], 0); } return EXIT_SUCCESS; }
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