On 3/18/24 14:31, Wei Gong wrote:
> when the thread pool is dynamically expanded, threads should
> not be created from the existing workers; they should be created
> from the newly expanded workers
>
> Signed-off-by: Wei Gong <[email protected]>
> ---
> src/util/virthreadpool.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/src/util/virthreadpool.c b/src/util/virthreadpool.c
> index d45fa92061..de8113df81 100644
> --- a/src/util/virthreadpool.c
> +++ b/src/util/virthreadpool.c
> @@ -184,7 +184,8 @@ virThreadPoolExpand(virThreadPool *pool, size_t gain,
> bool priority)
> size_t i = 0;
> struct virThreadPoolWorkerData *data = NULL;
>
> - VIR_EXPAND_N(*workers, *curWorkers, gain);
> + VIR_REALLOC_N(*workers, *curWorkers + gain);
> + memset(&(*workers)[*curWorkers], 0, sizeof(virThread) * gain);
I don't think it's safe to do this ^^^.
Firstly, pthread_t is an opaque type. We don't know if all zeroes are
valid value (that's why there are functions like pthread_equal()) or if
it's a valid init value.
Secondly, since *curWorkers is incremented at only after successful
thread creation, we can no longer get it to point to an uninitialized
array item.
I'll drop this line before pushing.
>
> for (i = 0; i < gain; i++) {
> g_autofree char *name = NULL;
> @@ -199,7 +200,7 @@ virThreadPoolExpand(virThreadPool *pool, size_t gain,
> bool priority)
> else
> name = g_strdup(pool->jobName);
>
> - if (virThreadCreateFull(&(*workers)[i],
> + if (virThreadCreateFull(&(*workers)[*curWorkers],
> false,
> virThreadPoolWorker,
> name,
> @@ -207,15 +208,13 @@ virThreadPoolExpand(virThreadPool *pool, size_t gain,
> bool priority)
> data) < 0) {
> VIR_FREE(data);
> virReportSystemError(errno, "%s", _("Failed to create thread"));
> - goto error;
> + return -1;
> }
> +
> + (*curWorkers)++;
> }
>
> return 0;
> -
> - error:
> - *curWorkers -= gain - i;
> - return -1;
> }
>
> virThreadPool *
Reviewed-by: Michal Privoznik <[email protected]>
and merged. Congratulations on your first libvirt contribution!
Michal
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