Hi,
On Linux 2.6.9, I am having a problem with pthread_exit().
My test program creates a thread from the main thread, detaches it, then
call pthread_exit(). The remaining thread should execute and then only
the process should exit. It is not what's happening right now. The
program returns right away
To figure out easily where we are, the spawned thread prints some stuff,
sleeps for 5 seconds and then prints something else.
If you launch that program, it will not print anything and return
right away. If you pass a parameter to the program, the main thread
will call sched_yield() before calling pthread_exit(). In this case, it
will work:
gmorin@linux:~> time ./foo
real 0m0.001s
user 0m0.000s
sys 0m0.001s
gmorin@linux:~> time ./foo yield
In f, sleeping 5 secs
Reached
real 0m5.003s
user 0m0.000s
sys 0m0.002s
gmorin@linux:~>
So it looks like the problem only appears if the spawned thread was not
scheduled.
FYI, Linuxthreads works well:
gmorin@linux:~> LD_ASSUME_KERNEL=2.4.1 ./foo
In f, sleeping 5 secs
Reached
Here is the source of the program:
#include <pthread.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
void * f(void * arg) {
puts("In f, sleeping 5 secs");
fflush(stdout);
sleep(5);
puts("Reached");
return NULL;
}
int main(int argc,char *argv[]) {
pthread_t t;
if (pthread_create(&t, NULL, f, NULL)) {
printf("error %s\n", strerror(errno));
return 1;
}
if (pthread_detach(t)) {
printf("error %s\n", strerror(errno));
return 1;
}
if (argc > 1)
sched_yield();
pthread_exit(0);
// not reached
return 2;
}
HTH. Guillaume.
PS: please keep all the CCs. Thanks in advance.
--
Guillaume Morin <[email protected]>
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