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author | Roland Dreier <roland@purestorage.com> | 2011-03-22 16:35:10 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:17 -0700 |
commit | e91f90bb0bb10be9cc8efd09a3cf4ecffcad0db1 (patch) | |
tree | bd9c134e875a3a96a5f96bbde9a112c180ba3d4f /crypto/tcrypt.h | |
parent | 77d1c8eb8a8e0989f4c46e9a40bbd4185d34974e (diff) |
aio: wake all waiters when destroying ctx
The test program below will hang because io_getevents() uses
add_wait_queue_exclusive(), which means the wake_up() in io_destroy() only
wakes up one of the threads. Fix this by using wake_up_all() in the aio
code paths where we want to make sure no one gets stuck.
// t.c -- compile with gcc -lpthread -laio t.c
#include <libaio.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
static const int nthr = 2;
void *getev(void *ctx)
{
struct io_event ev;
io_getevents(ctx, 1, 1, &ev, NULL);
printf("io_getevents returned\n");
return NULL;
}
int main(int argc, char *argv[])
{
io_context_t ctx = 0;
pthread_t thread[nthr];
int i;
io_setup(1024, &ctx);
for (i = 0; i < nthr; ++i)
pthread_create(&thread[i], NULL, getev, ctx);
sleep(1);
io_destroy(ctx);
for (i = 0; i < nthr; ++i)
pthread_join(thread[i], NULL);
return 0;
}
Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/tcrypt.h')
0 files changed, 0 insertions, 0 deletions