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lib/thread: Stop new I/O channel after thread is marked as exited

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This is a preparation to support voluntary thread termination by
calling spdk_thread_exit().

By the last patch, the asynchronous release of I/O channel will
complete even after spdk_thread_exit() because pending messages will
be reaped.

Then this patch stops new allocation of I/O channel after
spdk_thread_exit().

Hence we will be able to release all I/O channels for exiting
thread within finite time.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I48a45bcba7c4b2c62d8c9d398ac35a584b533627
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/821
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
This commit is contained in:
Shuhei Matsumoto 2020-02-10 18:00:30 -05:00 committed by Tomasz Zawadzki
parent d7393e2e4f
commit 13595495a1
2 changed files with 10 additions and 0 deletions
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6
lib/thread/thread.c
View File

@ -1140,6 +1140,12 @@ spdk_get_io_channel(void *io_device)
return NULL;
}
if (spdk_unlikely(thread->exit)) {
SPDK_ERRLOG("Thread %s is marked as exited\n", thread->name);
pthread_mutex_unlock(&g_devlist_mutex);
return NULL;
}
TAILQ_FOREACH(ch, &thread->io_channels, tailq) {
if (ch->dev == dev) {
ch->ref++;

4
test/unit/lib/thread/thread.c/thread_ut.c
View File

@ -801,6 +801,10 @@ thread_exit(void)
thread = spdk_get_thread();
spdk_thread_exit(thread);
/* Thread will not be able to get I/O channel after it is marked as exited. */
ch = spdk_get_io_channel(&g_device1);
CU_ASSERT(ch == NULL);
poll_threads();
CU_ASSERT(g_destroy_cb_calls == 1);