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