commands: don't lock the whole command

There are multiple reasons why this is not required:
- every command is transactional
- we only care about the list being modified not the memory allocation and
  other costly operations

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

src/lxc/commands.c

@@ -868,9 +868,7 @@ int lxc_cmd_add_state_client(const char *name, const char *lxcpath,
 		return state;
 	}
 
-	process_lock();
 	ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL);
-	process_unlock();
 	if (ret < 0) {
 		ERROR("%s - Failed to execute command", strerror(errno));
 		return -1;

src/lxc/commands_utils.c

@@ -33,6 +33,7 @@
 #include "commands_utils.h"
 #include "initutils.h"
 #include "log.h"
+#include "lxclock.h"
 #include "monitor.h"
 #include "state.h"
 #include "utils.h"
@@ -209,8 +210,10 @@ int lxc_add_state_client(int state_client_fd, struct lxc_handler *handler,
 		return -ENOMEM;
 	}
 
+	process_lock();
 	lxc_list_add_elem(tmplist, newclient);
 	lxc_list_add_tail(&handler->state_clients, tmplist);
+	process_unlock();
 
 	TRACE("added state client %d to state client list", state_client_fd);