| 1 | // SPDX-License-Identifier: MIT |
| 2 | // SPDX-FileCopyrightText: 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 3 | /* |
| 4 | * Basic test coverage for critical regions and rseq_current_cpu(). |
| 5 | */ |
| 6 | |
| 7 | #ifndef _GNU_SOURCE |
| 8 | #define _GNU_SOURCE |
| 9 | #endif |
| 10 | #include <assert.h> |
| 11 | #include <sched.h> |
| 12 | #include <signal.h> |
| 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #include <sys/time.h> |
| 16 | |
| 17 | #include <rseq/rseq.h> |
| 18 | |
| 19 | #include "tap.h" |
| 20 | |
| 21 | static void test_cpu_pointer(void) |
| 22 | { |
| 23 | cpu_set_t affinity, test_affinity; |
| 24 | int ret, i; |
| 25 | |
| 26 | ret = sched_getaffinity(0, sizeof(affinity), &affinity); |
| 27 | ok(ret == 0, "Get current thread affinity mask"); |
| 28 | |
| 29 | CPU_ZERO(&test_affinity); |
| 30 | for (i = 0; i < CPU_SETSIZE; i++) { |
| 31 | if (CPU_ISSET(i, &affinity)) { |
| 32 | int node; |
| 33 | |
| 34 | CPU_SET(i, &test_affinity); |
| 35 | |
| 36 | ret = sched_setaffinity(0, sizeof(test_affinity), |
| 37 | &test_affinity); |
| 38 | ok(ret == 0, "Set affinity mask to CPU %d exclusively", i); |
| 39 | |
| 40 | ok(sched_getcpu() == i, "sched_getcpu returns CPU %d", i); |
| 41 | ok(rseq_current_cpu() == (unsigned int) i, "rseq_current_cpu returns CPU %d", i); |
| 42 | ok(rseq_current_cpu_raw() == i, "rseq_current_cpu_raw returns CPU %d", i); |
| 43 | ok(rseq_cpu_start() == (unsigned int) i, "rseq_cpu_start returns CPU %d", i); |
| 44 | node = rseq_fallback_current_node(); |
| 45 | ok(rseq_fallback_current_node() == node, "rseq_fallback_current_node returns node %d", node); |
| 46 | CPU_CLR(i, &test_affinity); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | ret = sched_setaffinity(0, sizeof(affinity), &affinity); |
| 51 | ok(ret == 0, "Restore current thread initial affinity mask"); |
| 52 | } |
| 53 | |
| 54 | int main(void) |
| 55 | { |
| 56 | /* |
| 57 | * Skip all tests if the rseq syscall is unavailable |
| 58 | */ |
| 59 | if (rseq_available(RSEQ_AVAILABLE_QUERY_KERNEL)) { |
| 60 | plan_no_plan(); |
| 61 | } else { |
| 62 | plan_skip_all("The rseq syscall is unavailable"); |
| 63 | } |
| 64 | |
| 65 | if (rseq_register_current_thread()) { |
| 66 | fail("rseq_register_current_thread(...) failed(%d): %s\n", |
| 67 | errno, strerror(errno)); |
| 68 | goto end; |
| 69 | } else { |
| 70 | pass("Registered current thread with rseq"); |
| 71 | } |
| 72 | |
| 73 | test_cpu_pointer(); |
| 74 | |
| 75 | if (rseq_unregister_current_thread()) { |
| 76 | fail("rseq_unregister_current_thread(...) failed(%d): %s\n", |
| 77 | errno, strerror(errno)); |
| 78 | goto end; |
| 79 | } else { |
| 80 | pass("Unregistered current thread with rseq"); |
| 81 | } |
| 82 | |
| 83 | end: |
| 84 | exit(exit_status()); |
| 85 | } |