use pthread

ddtrace/internal/datadog/profiling/dd_wrapper/test/test_forking.cpp

@@ -3,14 +3,13 @@
 #include <gtest/gtest.h>
 
 #include <chrono>
+#include <pthread.h>
 
 // Initiate an upload in a separate thread, otherwise we won't be mid-upload during fork
-std::thread
-upload_in_thread()
-{
-    auto t = std::thread([&]() { ddup_upload(); });
+void* upload_in_thread(void*) {
+    ddup_upload();
 
-    return t;
+    return nullptr;
 }
 
 [[noreturn]] void
@@ -55,7 +54,12 @@ sample_in_threads_and_fork(unsigned int num_threads, unsigned int sleep_time_ns)
     // Collect some profiling data for a few ms, then upload in a thread before forking
     std::this_thread::sleep_for(std::chrono::milliseconds(500));
     join_samplers(threads, done);
-    auto upload_handle = upload_in_thread();
+
+    pthread_t thread;
+    if (pthread_create(&thread, nullptr, upload_in_thread, nullptr) != 0) {
+        std::cout << "failed to create thread" << std::endl;
+        std::exit(1);
+    }
 
     // Fork, wait in the parent for child to finish
     pid_t pid = fork();
@@ -64,7 +68,7 @@ sample_in_threads_and_fork(unsigned int num_threads, unsigned int sleep_time_ns)
         profile_in_child(num_threads, 500e3, done); // Child profiles for 500ms
     }
 
-    upload_handle.join();
+    pthread_join(thread, nullptr);
 
     // Parent
     int status;
@@ -93,7 +97,11 @@ fork_stress_test(unsigned int num_threads, unsigned int sleep_time_ns, unsigned
     launch_samplers(ids, sleep_time_ns, threads, done);
 
     std::vector<pid_t> children;
-    upload_in_thread();
+    pthread_t thread;
+    if (pthread_create(&thread, nullptr, upload_in_thread, nullptr) != 0) {
+        std::cout << "failed to create thread" << std::endl;
+        std::exit(1);
+    }
     while (num_children > 0) {
         pid_t pid = fork();
         if (pid == 0) {
@@ -107,7 +115,7 @@ fork_stress_test(unsigned int num_threads, unsigned int sleep_time_ns, unsigned
     // Parent
     int status;
     done.store(true);
-    upload_in_thread();
+    ddup_upload();
     for (pid_t pid : children) {
         waitpid(pid, &status, 0);
         if (!is_exit_normal(status)) {