Futex: turn "int" into "int32_t" for portability

[urcu.git] / urcu-call-rcu-impl.h

diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
index 82fec80fc2c857032a1d7831c568e47cc0e528c8..8a89295fa44bcc6dc18b84e671ec42705128ff06 100644 (file)
--- a/urcu-call-rcu-impl.h
+++ b/urcu-call-rcu-impl.h
@@ -26,6 +26,7 @@
 #include <signal.h>
 #include <assert.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <string.h>
 #include <errno.h>
 #include <poll.h>
@@ -39,14 +40,14 @@
 #include "urcu-call-rcu.h"
 #include "urcu-pointer.h"
 #include "urcu/list.h"
-#include "urcu/urcu-futex.h"
+#include "urcu/futex.h"
 
 /* Data structure that identifies a call_rcu thread. */
 
 struct call_rcu_data {
        struct cds_wfq_queue cbs;
        unsigned long flags;
-       int futex;
+       int32_t futex;
        unsigned long qlen; /* maintained for debugging. */
        pthread_t tid;
        int cpu_affinity;
@@ -211,12 +212,12 @@ static void *call_rcu_thread(void *arg)
        }
 
        thread_call_rcu_data = crdp;
+       if (!rt) {
+               uatomic_dec(&crdp->futex);
+               /* Decrement futex before reading call_rcu list */
+               cmm_smp_mb();
+       }
        for (;;) {
-               if (!rt) {
-                       uatomic_dec(&crdp->futex);
-                       /* Decrement futex before reading call_rcu list */
-                       cmm_smp_mb();
-               }
                if (&crdp->cbs.head != _CMM_LOAD_SHARED(crdp->cbs.tail)) {
                        while ((cbs = _CMM_LOAD_SHARED(crdp->cbs.head)) == NULL)
                                poll(NULL, 0, 1);
@@ -240,21 +241,32 @@ static void *call_rcu_thread(void *arg)
                        } while (cbs != NULL);
                        uatomic_sub(&crdp->qlen, cbcount);
                }
-               if (uatomic_read(&crdp->flags) & URCU_CALL_RCU_STOP) {
-                       if (!rt) {
+               if (uatomic_read(&crdp->flags) & URCU_CALL_RCU_STOP)
+                       break;
+               if (!rt) {
+                       if (&crdp->cbs.head
+                           == _CMM_LOAD_SHARED(crdp->cbs.tail)) {
+                               call_rcu_wait(crdp);
+                               poll(NULL, 0, 10);
+                               uatomic_dec(&crdp->futex);
                                /*
-                                * Read call_rcu list before write futex.
+                                * Decrement futex before reading
+                                * call_rcu list.
                                 */
                                cmm_smp_mb();
-                               uatomic_set(&crdp->futex, 0);
+                       } else {
+                               poll(NULL, 0, 10);
                        }
-                       break;
-               }
-               if (!rt) {
-                       if (&crdp->cbs.head == _CMM_LOAD_SHARED(crdp->cbs.tail))
-                               call_rcu_wait(crdp);
+               } else {
+                       poll(NULL, 0, 10);
                }
-               poll(NULL, 0, 10);
+       }
+       if (!rt) {
+               /*
+                * Read call_rcu list before write futex.
+                */
+               cmm_smp_mb();
+               uatomic_set(&crdp->futex, 0);
        }
        uatomic_or(&crdp->flags, URCU_CALL_RCU_STOPPED);
        return NULL;