Revert "remove spinlocks"

This reverts commit 1670c26313.

src/main.c

@@ -107,7 +107,6 @@ int palera1n(int argc, char *argv[], char *envp[]) {
 	pthread_mutex_init(&spin_mutex, NULL);
 	pthread_mutex_init(&found_pongo_mutex, NULL);
 	pthread_mutex_init(&ecid_dfu_wait_mutex, NULL);
-	pthread_cond_init(&spin, NULL);
 	if ((ret = build_checks())) return ret;
 	if ((ret = optparse(argc, argv))) goto cleanup;
 	if (!(palerain_flags & palerain_option_device_info) && (palerain_flags & palerain_option_palerain_version)) goto normal_exit;
@@ -141,7 +140,7 @@ int palera1n(int argc, char *argv[], char *envp[]) {
 	pthread_create(&pongo_thread, NULL, pongo_helper, NULL);
 	pthread_create(&dfuhelper_thread, NULL, dfuhelper, NULL);
 	pthread_join(dfuhelper_thread, NULL);
-	palerain_unblock();
+	set_spin(0);
 	if ((palerain_flags & (palerain_option_dfuhelper_only | 
 											  palerain_option_reboot_device  | 
 											  palerain_option_exit_recovery  | 
@@ -155,10 +154,14 @@ int palera1n(int argc, char *argv[], char *envp[]) {
 
 	if ((palerain_flags & (palerain_option_pongo_exit | palerain_option_demote)))
 		goto normal_exit;
+	set_spin(1);
 	sleep(2);
 	pthread_create(&pongo_thread, NULL, pongo_helper, NULL);
 	pthread_join(pongo_thread, NULL);
-	palerain_block();
+	while (get_spin())
+	{
+		sleep(1);
+	}
 normal_exit:
 cleanup:
 	if (override_kpf.magic == OVERRIDE_MAGIC) {
@@ -178,7 +181,6 @@ cleanup:
 	pthread_mutex_destroy(&spin_mutex);
 	pthread_mutex_destroy(&found_pongo_mutex);
 	pthread_mutex_destroy(&ecid_dfu_wait_mutex);
-	pthread_cond_destroy(&spin);
 	return ret;
 }