================
@@ -0,0 +1,70 @@
+#include <iostream>
+#include <mutex>
+#include <sys/wait.h>
+#include <thread>
+#include <unistd.h>
+#include <vector>
+
+pid_t g_pid = 0;
+std::mutex g_child_pids_mutex;
+std::vector<pid_t> g_child_pids;
+
+int call_vfork(int index) {
+ pid_t child_pid = vfork();
+
+ if (child_pid == -1) {
+ // Error handling
+ perror("vfork");
+ return 1;
+ } else if (child_pid == 0) {
+ // This code is executed by the child process
+ g_pid = getpid();
+ printf("Child process: %d\n", g_pid);
+ _exit(index + 10); // Exit the child process
+ } else {
+ // This code is executed by the parent process
+ printf("[Parent] Forked process id: %d\n", child_pid);
+ }
+ return 0;
+}
+
+void wait_all_children_to_exit() {
+ std::lock_guard<std::mutex> Lock(g_child_pids_mutex);
+ for (pid_t child_pid : g_child_pids) {
+ int child_status = 0;
+ pid_t pid = waitpid(child_pid, &child_status, 0);
+ if (child_status != 0) {
+ int exit_code = WEXITSTATUS(child_status);
+ if (exit_code > 15 || exit_code < 10) {
+ printf("Error: child process exits with unexpected code %d\n",
+ exit_code);
+ _exit(1); // This will let our program know that some child processes
+ // didn't exist with an expected exit status.
+ }
+ }
+ if (pid != child_pid)
+ _exit(2); // This will let our program know it didn't succeed
+ }
+}
+
+void create_threads(int num_threads) {
+ std::vector<std::thread> threads;
+ for (int i = 0; i < num_threads; ++i) {
+ threads.emplace_back(std::thread(call_vfork, i));
+ }
+ printf("Created %d threads, joining...\n",
+ num_threads); // end_of_create_threads
+ for (auto &thread : threads) {
+ thread.join();
+ }
+ wait_all_children_to_exit();
+}
+
+int main() {
----------------
clayborg wrote:
Add `argc` and `argv` so we can parse args to see which fork we should use and
if we should call exec().
```
int main(int argc, const char **argv) {
```
https://github.com/llvm/llvm-project/pull/81564
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