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Overhaul Windows signal handling

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The new asynchronous signal delivery technique is now also being used
for tkill(), raise(), etc. Many subtle issues have been addresesd. We
now signal handling on Windows that's remarkably similar to the POSIX
behaviors. However that's just across threads. We're lacking a way to
have the signal semantics work well, across multiple WIN32 processes.
This commit is contained in:
Justine Tunney 2023-09-08 01:49:41 -07:00
parent 8bdaddd81d
commit 99dc1281f5
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GPG key ID: BE714B4575D6E328
38 changed files with 635 additions and 279 deletions
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52
test/libc/thread/pthread_kill_test.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/dce.h"
@ -23,6 +24,7 @@
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/subprocess.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
@ -62,3 +64,53 @@ TEST(pthread_kill, canCancelReadOperation) {
ASSERT_SYS(0, 0, close(fds[1]));
ASSERT_SYS(0, 0, sigaction(SIGUSR1, &oldsa, 0));
}
volatile unsigned got_sig_async;
volatile pthread_t cpu_worker_th;
volatile unsigned is_wasting_cpu;
void OnSigAsync(int sig) {
ASSERT_TRUE(pthread_equal(cpu_worker_th, pthread_self()));
got_sig_async = 1;
}
void *CpuWorker(void *arg) {
cpu_worker_th = pthread_self();
while (!got_sig_async) {
is_wasting_cpu = 1;
}
return 0;
}
TEST(pthread_kill, canAsynchronouslyRunHandlerInsideTargetThread) {
pthread_t t;
struct sigaction oldsa;
struct sigaction sa = {.sa_handler = OnSigAsync};
ASSERT_SYS(0, 0, sigaction(SIGUSR1, &sa, &oldsa));
ASSERT_EQ(0, pthread_create(&t, 0, CpuWorker, 0));
while (!is_wasting_cpu) donothing;
ASSERT_EQ(0, pthread_kill(t, SIGUSR1));
ASSERT_EQ(0, pthread_join(t, 0));
ASSERT_TRUE(got_sig_async);
ASSERT_SYS(0, 0, sigaction(SIGUSR1, &oldsa, 0));
}
volatile int is_having_fun;
void *FunWorker(void *arg) {
for (;;) {
is_having_fun = 1;
sched_yield();
}
return 0;
}
TEST(pthread_kill, defaultThreadSignalHandlerWillKillWholeProcess) {
SPAWN(fork);
pthread_t t;
ASSERT_EQ(0, pthread_create(&t, 0, FunWorker, 0));
while (!is_having_fun) sched_yield();
ASSERT_SYS(0, 0, pthread_kill(t, SIGKILL));
for (;;) sched_yield();
TERMS(SIGKILL);
}