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#include <stdio.h>
// #include <libunwind.h>
#include <unistd.h>
#include <pthread.h>
// void customFunction1(int n);
void *customFunction1(void *n);
void customFunction2(int n);
void customFunction3(int n);
// Call this function to get a backtrace.
// void backtrace() {
// unw_cursor_t cursor;
// unw_context_t context;
// // Initialize cursor to current frame for local unwinding.
// unw_getcontext(&context);
// unw_init_local(&cursor, &context);
// // Unwind frames one by one, going up the frame stack.
// while (unw_step(&cursor) > 0) {
// unw_word_t offset, pc;
// unw_get_reg(&cursor, UNW_REG_IP, &pc);
// if (pc == 0) {
// break;
// }
// printf("0x%lx:", pc);
// char sym[256];
// if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0) {
// printf(" (%s+0x%lx)\n", sym, offset);
// } else {
// printf(" -- error: unable to obtain symbol name for this frame\n");
// }
// }
// }
void *customFunction1(void *n) {
int num = *((int *)n);
if(num <= 0) {
printf("End of recursion\n");
printf("pid: %d\n", getpid());
while (1) {
sleep(1);
} // never return, keep stack
// return NULL;
} else {
printf("Calling customFunction2\n");
customFunction2(num-1);
}
return NULL;
}
void customFunction2(int n) {
printf("Calling customFunction2\n");
if(n <= 0) {
printf("End of recursion\n");
printf("pid: %d\n", getpid());
while (1) {
sleep(1);
} // never return, keep stack
// return NULL;
}
customFunction3(n-1);
}
void customFunction3(int n) {
printf("Calling customFunction3\n");
if(n <= 0) {
printf("End of recursion\n");
printf("pid: %d\n", getpid());
while (1) {
sleep(1);
} // never return, keep stack
// return NULL;
}
customFunction2(n-1);
}
int main() {
int num1 = 4;
int num2 = 5;
int num3 = 6;
pthread_t thread_id1, thread_id2, thread_id3;
pthread_create(&thread_id1, NULL, customFunction1, &num1);
pthread_create(&thread_id2, NULL, customFunction1, &num2);
pthread_create(&thread_id3, NULL, customFunction1, &num3);
pthread_join(thread_id1, NULL);
pthread_join(thread_id2, NULL);
pthread_join(thread_id3, NULL);
return 0;
}
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