Remove obsolete INITLIST macro.

[bertos.git] / kern / sem.c

diff --git a/kern/sem.c b/kern/sem.c
index 84028be65e77a2a9ff492bdf57b5d44af5d1891f..05488e4c2fab64d3b057a6d9a5b5c2d526451514 100755 (executable)
--- a/kern/sem.c
+++ b/kern/sem.c
@@ -1,8 +1,8 @@
 /*!
  * \file
  * <!--
- * Copyright 2001,2004 Develer S.r.l. (http://www.develer.com/)
- * Copyright 1999,2000,2001 Bernardo Innocenti <bernie@develer.com>
+ * Copyright 2001, 2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999, 2000, 2001 Bernardo Innocenti <bernie@develer.com>
  * This file is part of DevLib - See devlib/README for information.
  * -->
  *
@@ -13,18 +13,29 @@
  * \author Bernardo Innocenti <bernie@develer.com>
  */
 
-/*
- * $Log$
- * Revision 1.3  2004/08/08 05:53:23  bernie
- * Use DISABLE_IRQSAVE/ENABLE_IRQRESTORE; Cleanup documentation.
- *
- * Revision 1.2  2004/06/03 11:27:09  bernie
- * Add dual-license information.
- *
- * Revision 1.1  2004/05/23 17:27:00  bernie
- * Import kern/ subdirectory.
- *
- */
+/*#*
+ *#* $Log$
+ *#* Revision 1.7  2004/11/28 23:20:25  bernie
+ *#* Remove obsolete INITLIST macro.
+ *#*
+ *#* Revision 1.6  2004/10/21 10:57:21  bernie
+ *#* Use proc_forbid()/proc_permit().
+ *#*
+ *#* Revision 1.5  2004/10/21 10:48:57  bernie
+ *#* sem_release(): Simplify (made by rasky on scfirm).
+ *#*
+ *#* Revision 1.4  2004/08/25 14:12:09  rasky
+ *#* Aggiornato il comment block dei log RCS
+ *#*
+ *#* Revision 1.3  2004/08/08 05:53:23  bernie
+ *#* Use DISABLE_IRQSAVE/ENABLE_IRQRESTORE; Cleanup documentation.
+ *#*
+ *#* Revision 1.2  2004/06/03 11:27:09  bernie
+ *#* Add dual-license information.
+ *#*
+ *#* Revision 1.1  2004/05/23 17:27:00  bernie
+ *#* Import kern/ subdirectory.
+ *#*/
 
 #include "sem.h"
 #include "proc.h"
@@ -34,11 +45,11 @@
 
 
 /*!
- * \brief Initialize a Semaphore structure
+ * \brief Initialize a Semaphore structure.
  */
 void sem_init(struct Semaphore *s)
 {
-       INITLIST(&s->wait_queue);
+       LIST_INIT(&s->wait_queue);
        s->owner = NULL;
        s->nest_count = 0;
 }
@@ -57,19 +68,18 @@ void sem_init(struct Semaphore *s)
  */
 bool sem_attempt(struct Semaphore *s)
 {
-       cpuflags_t flags;
-       DISABLE_IRQSAVE(flags);
+       bool result = false;
 
+       proc_forbid();
        if ((!s->owner) || (s->owner == CurrentProcess))
        {
                s->owner = CurrentProcess;
                s->nest_count++;
-               ENABLE_INTS;
-               return true;
+               result = true;
        }
+       proc_permit();
 
-       ENABLE_IRQRESTORE(flags);
-       return false;
+       return result;
 }
 
 
@@ -92,21 +102,20 @@ bool sem_attempt(struct Semaphore *s)
  */
 void sem_obtain(struct Semaphore *s)
 {
-       cpuflags_t flags;
-       DISABLE_IRQSAVE(flags);
+       proc_forbid();
 
        /* Is the semaphore already locked by another process? */
        if (UNLIKELY(s->owner && (s->owner != CurrentProcess)))
        {
                /* Append calling process to the wait queue */
                ADDTAIL(&s->wait_queue, (Node *)CurrentProcess);
-               ENABLE_IRQRESTORE(flags);
 
                /*
                 * We will wake up only when the current owner calls
                 * sem_release(). Then, the semaphore will already
                 * be locked for us.
                 */
+               proc_permit();
                proc_schedule();
        }
        else
@@ -114,13 +123,13 @@ void sem_obtain(struct Semaphore *s)
                /* The semaphore was free: lock it */
                s->owner = CurrentProcess;
                s->nest_count++;
-               ENABLE_IRQRESTORE(flags);
+               proc_permit();
        }
 }
 
 
 /*!
- * \brief Releases a lock on a previously locked semaphore.
+ * \brief Release a lock on a previously locked semaphore.
  *
  * If the nesting count of the semaphore reaches zero,
  * the next process waiting for it will be awaken.
@@ -134,30 +143,27 @@ void sem_obtain(struct Semaphore *s)
  */
 void sem_release(struct Semaphore *s)
 {
-       cpuflags_t flags;
-       DISABLE_IRQSAVE(flags);
+       proc_forbid();
 
        /*
-        * Decremement nesting count and check if the semaphore
-        * has been fully unlocked
+        * Decrement nesting count and check if the semaphore
+        * has been fully unlocked.
         */
        if (--s->nest_count == 0)
        {
+               Process *proc;
+
                /* Disown semaphore */
                s->owner = NULL;
 
-               /* Anybody still waiting for this semaphore? */
-               if (!ISLISTEMPTY(&s->wait_queue))
+               /* Give semaphore to the first applicant, if any */
+               if (UNLIKELY((proc = (Process *)REMHEAD(&s->wait_queue))))
                {
-                       /* Give semaphore to the first applicant */
-                       Process *proc = (Process *)s->wait_queue.head;
-                       REMOVE((Node *)proc);
                        s->nest_count = 1;
                        s->owner = proc;
                        SCHED_ENQUEUE(proc);
                }
        }
 
-       ENABLE_IRQRESTORE(flags);
+       proc_permit();
 }
-