#ifdef T_NAMESPACE #undef T_NAMESPACE #endif #include <darwintest.h> #include <spawn.h> #include <stdlib.h> #include <unistd.h> T_GLOBAL_META( T_META_NAMESPACE("xnu.perf"), T_META_CHECK_LEAKS(false), T_META_TAG_PERF ); #define SPAWN_MEASURE_LOOP(s) \ char *args[] = {"/usr/bin/true", NULL}; \ int err; \ pid_t pid; \ int status; \ while (!dt_stat_stable(s)) { \ T_STAT_MEASURE(s) { \ err = posix_spawn(&pid, args[0], NULL, NULL, args, NULL); \ } \ if (err) { \ T_FAIL("posix_spawn returned %d", err); \ } \ waitpid(pid, &status, 0); \ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \ T_FAIL("Child process of posix_spawn failed to run"); \ } \ } T_DECL(posix_spawn_platform_binary_latency, "posix_spawn platform binary latency") { { dt_stat_time_t s = dt_stat_time_create("time"); SPAWN_MEASURE_LOOP(s); dt_stat_finalize(s); } { dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on_cpu_time"); SPAWN_MEASURE_LOOP(s); dt_stat_finalize(s); } } #define FORK_MEASURE_LOOP(s) \ pid_t pid; \ int status; \ while (!dt_stat_stable(s)) { \ T_STAT_MEASURE(s) { \ pid = fork(); \ if (pid == 0) \ exit(0); \ else if (pid == -1) \ T_FAIL("fork returned -1"); \ } \ waitpid(pid, &status, 0); \ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \ T_FAIL("forked process failed to exit properly"); \ } \ } T_DECL(fork, "fork latency") { { dt_stat_time_t s = dt_stat_time_create("time"); FORK_MEASURE_LOOP(s); dt_stat_finalize(s); } { dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on_cpu_time"); FORK_MEASURE_LOOP(s); dt_stat_finalize(s); } }