TLS struct destructors not called when thread is not joined #10809
Description
With the following on Linux (or Windows Subsytem for Linux)/Ubuntu
#include <stdio.h>
#include <iostream>
#if EMSCRIPTEN
include <emscripten.h>
#else
#include <chrono>
#include <thread>
#endif
struct TlsDestructionMonitor
{
public:
TlsDestructionMonitor() {
std::cout << "ctr " << std::uintptr_t(this);
printf("Constructor()\n");
}
void Set()
{
printf("set\n");
}
~TlsDestructionMonitor()
{
printf("dest\n");
}
};
thread_local TlsDestructionMonitor tls_destructionMonitor;
void* doWork(void *arg)
{
printf("thread doing work\n");
tls_destructionMonitor.Set();
return NULL;
}
int main()
{
pthread_t thread;
pthread_attr_t attr;
void * retVal;
printf("hello\n");
int id = pthread_create(&thread, NULL, &doWork, NULL);
if(!id)
{
printf("sleeping\n");
#if EMSCRIPTEN
emscripten_sleep(1000);
#else
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
#endif
printf("slept\n");
//printf("joining\n");
// //pthread_join(thread, &retVal);
// //printf("joined\n");
// }
}
return(0);
}
Compile with
g++ 1.cpp -lpthread -pthread
and run
./a.out
and you get
hello
sleeping
thread doing work
ctr 140391460898558Constructor()
set
dest
slept
The dest is from the destructor of the struct. Same code with
em++ t.cpp -s USE_PTHREADS=1 -o t.html --emrun -s PROXY_TO_PTHREAD=1 -s ASYNCIFY=1
And run it in New Edge (Chrome backend) and you get
hello
sleeping
thread doing work
ctr 5398504Constructor()
set
slept
The destructor is not called. If you replace the main thread's sleep with a join it works the same on Linux and Emscripten.
Possibly related to #9251 although that's about exit and ending all threads.