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- Log ----------------------------------------------------------------- commit 6947621e1b3a3c73c3ee351325f505e5e191474f Author: Josep Puigdemont josep.puigdemont@linaro.org Date: Mon Apr 23 13:48:22 2018 +0200
linux-gen: fdserver: remove unnecessary locking
The locks in fdserver's operations don't serve any purpose, there is no need to acquire a lock when registering a file descriptor to the server, specially because the only place where the registering function is used is already protected by another lock, and the same goes for deregistering. Also, the fdserver handles requests sequentially.
On the other hand, removing the lock from the lookup function may return a fd that is being deregistered, but this is not protecting us from misusing it because the operation to be unregistered may be queued right after the lookup request, at which point the fd is already invalid anyway.
Signed-off-by: Josep Puigdemont josep.puigdemont@linaro.org Reviewed-by: Bill Fischofer bill.fischofer@linaro.org Signed-off-by: Maxim Uvarov maxim.uvarov@linaro.org
diff --git a/platform/linux-generic/odp_fdserver.c b/platform/linux-generic/odp_fdserver.c index 0e9fb0e4..774fe360 100644 --- a/platform/linux-generic/odp_fdserver.c +++ b/platform/linux-generic/odp_fdserver.c @@ -39,7 +39,6 @@ */
#include <odp_posix_extensions.h> -#include <odp/api/spinlock.h> #include <odp_internal.h> #include <odp_debug_internal.h> #include <odp_fdserver_internal.h> @@ -78,9 +77,6 @@ ODP_DBG(fmt, ##__VA_ARGS__);\ } while (0)
-/* when accessing the client functions, clients should be mutexed: */ -static odp_spinlock_t *client_lock; - /* define the tables of file descriptors handled by this server: */ #define FDSERVER_MAX_ENTRIES 256 typedef struct fdentry_s { @@ -288,23 +284,18 @@ int _odp_fdserver_register_fd(fd_server_context_e context, uint64_t key, int command; int fd;
- odp_spinlock_lock(client_lock); - FD_ODP_DBG("FD client register: pid=%d key=%" PRIu64 ", fd=%d\n", getpid(), key, fd_to_send);
s_sock = get_socket(); - if (s_sock < 0) { - odp_spinlock_unlock(client_lock); + if (s_sock < 0) return -1; - }
res = send_fdserver_msg(s_sock, FD_REGISTER_REQ, context, key, fd_to_send); if (res < 0) { ODP_ERR("fd registration failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
@@ -313,13 +304,11 @@ int _odp_fdserver_register_fd(fd_server_context_e context, uint64_t key, if ((res < 0) || (command != FD_REGISTER_ACK)) { ODP_ERR("fd registration failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
close(s_sock);
- odp_spinlock_unlock(client_lock); return 0; }
@@ -334,22 +323,17 @@ int _odp_fdserver_deregister_fd(fd_server_context_e context, uint64_t key) int command; int fd;
- odp_spinlock_lock(client_lock); - FD_ODP_DBG("FD client deregister: pid=%d key=%" PRIu64 "\n", getpid(), key);
s_sock = get_socket(); - if (s_sock < 0) { - odp_spinlock_unlock(client_lock); + if (s_sock < 0) return -1; - }
res = send_fdserver_msg(s_sock, FD_DEREGISTER_REQ, context, key, -1); if (res < 0) { ODP_ERR("fd de-registration failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
@@ -358,13 +342,11 @@ int _odp_fdserver_deregister_fd(fd_server_context_e context, uint64_t key) if ((res < 0) || (command != FD_DEREGISTER_ACK)) { ODP_ERR("fd de-registration failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
close(s_sock);
- odp_spinlock_unlock(client_lock); return 0; }
@@ -380,19 +362,14 @@ int _odp_fdserver_lookup_fd(fd_server_context_e context, uint64_t key) int command; int fd;
- odp_spinlock_lock(client_lock); - s_sock = get_socket(); - if (s_sock < 0) { - odp_spinlock_unlock(client_lock); + if (s_sock < 0) return -1; - }
res = send_fdserver_msg(s_sock, FD_LOOKUP_REQ, context, key, -1); if (res < 0) { ODP_ERR("fd lookup failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
@@ -401,7 +378,6 @@ int _odp_fdserver_lookup_fd(fd_server_context_e context, uint64_t key) if ((res < 0) || (command != FD_LOOKUP_ACK)) { ODP_ERR("fd lookup failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
@@ -409,7 +385,6 @@ int _odp_fdserver_lookup_fd(fd_server_context_e context, uint64_t key) ODP_DBG("FD client lookup: pid=%d, key=%" PRIu64 ", fd=%d\n", getpid(), key, fd);
- odp_spinlock_unlock(client_lock); return fd; }
@@ -421,27 +396,21 @@ static int stop_server(void) int s_sock; /* server socket */ int res;
- odp_spinlock_lock(client_lock); - FD_ODP_DBG("FD sending server stop request\n");
s_sock = get_socket(); - if (s_sock < 0) { - odp_spinlock_unlock(client_lock); + if (s_sock < 0) return -1; - }
res = send_fdserver_msg(s_sock, FD_SERVERSTOP_REQ, 0, 0, -1); if (res < 0) { ODP_ERR("fd stop request failure\n"); close(s_sock); - odp_spinlock_unlock(client_lock); return -1; }
close(s_sock);
- odp_spinlock_unlock(client_lock); return 0; }
@@ -595,12 +564,6 @@ int _odp_fdserver_init_global(void) pid_t server_pid; int res;
- /* create the client spinlock that any client can see: */ - client_lock = mmap(NULL, sizeof(odp_spinlock_t), PROT_READ | PROT_WRITE, - MAP_SHARED | MAP_ANONYMOUS, -1, 0); - - odp_spinlock_init(client_lock); - snprintf(sockpath, FDSERVER_SOCKPATH_MAXLEN, FDSERVER_SOCKDIR_FORMAT, odp_global_data.shm_dir, odp_global_data.uid);
-----------------------------------------------------------------------
Summary of changes: platform/linux-generic/odp_fdserver.c | 45 ++++------------------------------- 1 file changed, 4 insertions(+), 41 deletions(-)
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