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Make _Thread_local work across platforms

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We now rewrite the binary image at runtime on Windows and XNU to change
mov %fs:0,%reg instructions to use %gs instead. There's also simpler
threading API introduced by this change and it's called _spawn() and
_join(), which has replaced most clone() usage.
This commit is contained in:
Justine Tunney 2022-07-10 04:01:17 -07:00
parent e4d6e263d4
commit 5f4f6b0e69
51 changed files with 808 additions and 1043 deletions
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23
test/libc/rand/rand64_test.c
View file

@ -37,6 +37,7 @@
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/spawn.h"
#include "libc/thread/thread.h"
#include "libc/time/time.h"
@ -54,7 +55,7 @@ dontinline void Generate(int i) {
A[i] = rand64();
}
int Thrasher(void *arg) {
int Thrasher(void *arg, int tid) {
int i, id = (intptr_t)arg;
while (!atomic_load(&ready)) {
cthread_memory_wait32(&ready, 0, 0);
@ -83,9 +84,8 @@ TEST(rand64, testLcg_doesntProduceIdenticalValues) {
TEST(rand64, testThreadSafety_doesntProduceIdenticalValues) {
int i, j, rc, ws;
sigset_t ss, oldss;
char *tls[THREADS];
void *stacks[THREADS];
struct sigaction oldsa;
struct spawn th[THREADS];
struct sigaction sa = {.sa_handler = OnChld, .sa_flags = SA_RESTART};
EXPECT_NE(-1, sigaction(SIGCHLD, &sa, &oldsa));
bzero(A, sizeof(A));
@ -94,25 +94,12 @@ TEST(rand64, testThreadSafety_doesntProduceIdenticalValues) {
EXPECT_EQ(0, sigprocmask(SIG_BLOCK, &ss, &oldss));
ready = false;
for (i = 0; i < THREADS; ++i) {
tls[i] = __initialize_tls(calloc(1, 64));
stacks[i] = mmap(0, GetStackSize(), PROT_READ | PROT_WRITE,
MAP_STACK | MAP_ANONYMOUS, -1, 0);
ASSERT_NE(
-1,
clone(Thrasher, stacks[i], GetStackSize(),
CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
CLONE_SETTLS | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID,
(void *)(intptr_t)i, 0, tls[i], 64, (int *)(tls[i] + 0x38)));
ASSERT_SYS(0, 0, _spawn(Thrasher, (void *)(intptr_t)i, th + i));
}
atomic_store(&ready, 1);
cthread_memory_wake32(&ready, INT_MAX);
for (i = 0; i < THREADS; ++i) {
while ((j = atomic_load((uint32_t *)(tls[i] + 0x38)))) {
// FUTEX_WAIT_PRIVATE makes it hang
cthread_memory_wait32((int *)(tls[i] + 0x38), j, 0);
}
EXPECT_SYS(0, 0, munmap(stacks[i], GetStackSize()));
free(tls[i]);
ASSERT_SYS(0, 0, _join(th + i));
}
sigaction(SIGCHLD, &oldsa, 0);
sigprocmask(SIG_BLOCK, &oldss, 0);