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Don't preempt WIN32 libraries

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This change refactors our POSIX signals emulation for Windows so that it
performs some additional safety checks before calling SetThreadContext()
which needs to be locked and must never ever interrupt Microsoft's code.
Kudos to the the Go developers for figuring out how to do this properly.
This commit is contained in:
Justine Tunney 2023-10-13 13:56:14 -07:00
parent d1a283a588
commit aca2261cda
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GPG key ID: BE714B4575D6E328
5 changed files with 61 additions and 30 deletions
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7
test/libc/calls/sig_test.c
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@ -19,6 +19,7 @@
#include "libc/sysv/consts/sig.h"
#include "libc/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/dce.h"
#include "libc/errno.h"
@ -26,6 +27,7 @@
#include "libc/nt/enum/context.h"
#include "libc/nt/struct/context.h"
#include "libc/nt/thread.h"
#include "libc/runtime/clktck.h"
#include "libc/sock/struct/pollfd.h"
#include "libc/sysv/consts/poll.h"
#include "libc/testlib/testlib.h"
@ -64,6 +66,7 @@ TEST(SetThreadContext, test) {
if (!IsWindows()) return;
ASSERT_EQ(0, pthread_create(&th, 0, Worker, 0));
while (!ready) donothing;
usleep(1000);
int64_t hand = _pthread_syshand((struct PosixThread *)th);
ASSERT_EQ(0, SuspendThread(hand));
struct NtContext nc;
@ -101,9 +104,9 @@ TEST(poll, interrupt) {
signal(SIGUSR1, OnSig);
ASSERT_SYS(0, 0, pipe(pfds));
ASSERT_EQ(0, pthread_create(&th, 0, Worker2, 0));
for (int i = 0; i < 100; ++i) {
for (int i = 0; i < 20; ++i) {
ASSERT_EQ(0, pthread_kill(th, SIGUSR1));
usleep(1000);
usleep(1e6 / CLK_TCK * 2);
}
isdone = true;
ASSERT_EQ(0, pthread_kill(th, SIGUSR1));