Previously, we were putting an exclusive lock to prevent secondary
processes spinning up while we are sending our messages. However,
using exclusive locks had an effect of disallowing multiple
simultaenous unrelated messages/requests being sent, which was
not the intention behind locking.
Fix it to put a shared lock on the directory. That way, we still
prevent secondary process initializations while sending data over
IPC, but allow multiple unrelated transmissions to proceed.
Fixes:
89f1fe7e6d95 ("eal: lock IPC directory on init and send")
Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Tested-by: Qi Zhang <qi.z.zhang@intel.com>
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
- if (flock(dir_fd, LOCK_EX)) {
+ if (flock(dir_fd, LOCK_SH)) {
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
rte_errno = errno;
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
rte_errno = errno;
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
- if (flock(dir_fd, LOCK_EX)) {
+ if (flock(dir_fd, LOCK_SH)) {
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
closedir(mp_dir);
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
closedir(mp_dir);
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
dir_fd = dirfd(mp_dir);
/* lock the directory to prevent processes spinning up while we send */
- if (flock(dir_fd, LOCK_EX)) {
+ if (flock(dir_fd, LOCK_SH)) {
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
rte_errno = errno;
RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
mp_dir_path);
rte_errno = errno;