cadcdev-svn-commits Mailing List for Cryptic Allusion DCDev (Page 7)

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- Log -----------------------------------------------------------------
commit 93519b5546411b0d6a723f74884753056212ff97
Author: Paul Cercueil <pa...@cr...>
Date:   Mon Sep 23 06:40:24 2024 +0200

    Scoped IRQ disable (#765)
    
    * irq: Add irq_disable_scoped()
    
    This macro will disable interrupts, similarly to irq_disable(), with the
    difference that the interrupt state will automatically be restored once the
    execution exits the functional block in which the macro was called.
    
    Signed-off-by: Paul Cercueil <pa...@cr...>
    
    * thread: Use irq_disable_scoped()
    
    Factorize code by using the new irq_disable_scoped() macro.
    
    Signed-off-by: Paul Cercueil <pa...@cr...>
    
    * net: Use irq_disable_scoped()
    
    Factorize code by using the new irq_disable_scoped() macro.
    
    Signed-off-by: Paul Cercueil <pa...@cr...>
    
    * exports: Use irq_disable_scoped()
    
    Factorize code by using the new irq_disable_scoped() macro.
    
    Signed-off-by: Paul Cercueil <pa...@cr...>
    
    ---------
    
    Signed-off-by: Paul Cercueil <pa...@cr...>

-----------------------------------------------------------------------

Summary of changes:
 kernel/arch/dreamcast/include/arch/irq.h |  19 ++++
 kernel/exports/library.c                 |   9 +-
 kernel/net/net_dhcp.c                    |   5 +-
 kernel/net/net_tcp.c                     |   5 +-
 kernel/net/net_thd.c                     |  10 +--
 kernel/thread/cond.c                     |  24 ++---
 kernel/thread/genwait.c                  |  27 ++----
 kernel/thread/mutex.c                    | 111 +++++++++++------------
 kernel/thread/rwsem.c                    | 145 ++++++++++++-------------------
 kernel/thread/sem.c                      |  19 ++--
 kernel/thread/thread.c                   |  27 ++----
 kernel/thread/worker.c                   |  15 +---
 12 files changed, 164 insertions(+), 252 deletions(-)

diff --git a/kernel/arch/dreamcast/include/arch/irq.h b/kernel/arch/dreamcast/include/arch/irq.h
index f9bcdbf8..8b47a5e9 100644
--- a/kernel/arch/dreamcast/include/arch/irq.h
+++ b/kernel/arch/dreamcast/include/arch/irq.h
@@ -434,6 +434,25 @@ int irq_init(void);
 */
 void irq_shutdown(void);
 
+/** \cond */
+static inline void __irq_scoped_cleanup(int *state) {
+    irq_restore(*state);
+}
+
+#define ___irq_disable_scoped(l) \
+    int __scoped_irq_##l __attribute__((cleanup(__irq_scoped_cleanup))) = irq_disable()
+
+#define __irq_disable_scoped(l) ___irq_disable_scoped(l)
+/** \endcond */
+
+/** \brief  Disable interrupts with scope management.
+
+    This macro will disable interrupts, similarly to irq_disable(), with the
+    difference that the interrupt state will automatically be restored once the
+    execution exits the functional block in which the macro was called.
+*/
+#define irq_disable_scoped() __irq_disable_scoped(__LINE__)
+
 __END_DECLS
 
 #endif  /* __ARCH_IRQ_H */
diff --git a/kernel/exports/library.c b/kernel/exports/library.c
index 22db0a3c..0b602296 100644
--- a/kernel/exports/library.c
+++ b/kernel/exports/library.c
@@ -107,11 +107,10 @@ klibrary_t *library_by_libid(libid_t libid) {
 /* Library shell creation and deletion */
 
 klibrary_t * library_create(int flags) {
-    int     oldirq = 0;
     klibrary_t  * np;
     libid_t     libid;
 
-    oldirq = irq_disable();
+    irq_disable_scoped();
     np = NULL;
 
     /* Get a new library id */
@@ -135,7 +134,6 @@ klibrary_t * library_create(int flags) {
         }
     }
 
-    irq_restore(oldirq);
     return np;
 }
 
@@ -200,18 +198,15 @@ uint32 library_get_version(klibrary_t * lib) {
 
 /*****************************************************************************/
 klibrary_t * library_lookup(const char * name) {
-    int     old;
     klibrary_t  * lib;
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     LIST_FOREACH(lib, &library_list, list) {
         if(!strcasecmp(lib->lib_get_name(), name))
             break;
     }
 
-    irq_restore(old);
-
     if(!lib)
         errno = ENOENT;
 
diff --git a/kernel/net/net_dhcp.c b/kernel/net/net_dhcp.c
index 572df741..064a8964 100644
--- a/kernel/net/net_dhcp.c
+++ b/kernel/net/net_dhcp.c
@@ -392,7 +392,8 @@ static void net_dhcp_renew(void) {
 
 static void net_dhcp_bind(dhcp_pkt_t *pkt, int len) {
     uint32 tmp = ntohl(pkt->yiaddr);
-    uint32 old = irq_disable();
+
+    irq_disable_scoped();
 
     /* Bind the IP address first */
     net_default_dev->ip_addr[0] = (tmp >> 24) & 0xFF;
@@ -476,8 +477,6 @@ static void net_dhcp_bind(dhcp_pkt_t *pkt, int len) {
     }
 
     state = DHCP_STATE_BOUND;
-
-    irq_restore(old);
 }
 
 static void net_dhcp_thd(void *obj) {
diff --git a/kernel/net/net_tcp.c b/kernel/net/net_tcp.c
index f4902d61..866aed78 100644
--- a/kernel/net/net_tcp.c
+++ b/kernel/net/net_tcp.c
@@ -2971,14 +2971,13 @@ int net_tcp_init(void) {
 
 void net_tcp_shutdown(void) {
     struct tcp_sock *i, *tmp;
-    int old;
 
     /* Kill the thread and make sure we can grab the lock */
     if(thd_cb_id >= 0)
         net_thd_del_callback(thd_cb_id);
 
     /* Disable IRQs so we can kill the sockets in peace... */
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Clean up existing sockets */
     i = LIST_FIRST(&tcp_socks);
@@ -3006,6 +3005,4 @@ void net_tcp_shutdown(void) {
 
     /* Remove us from fs_socket and clean up the semaphore */
     fs_socket_proto_remove(&proto);
-
-    irq_restore(old);
 }
diff --git a/kernel/net/net_thd.c b/kernel/net/net_thd.c
index a270a651..8e5f571e 100644
--- a/kernel/net/net_thd.c
+++ b/kernel/net/net_thd.c
@@ -55,7 +55,6 @@ static void *net_thd_thd(void *data) {
 }
 
 int net_thd_add_callback(void (*cb)(void *), void *data, uint64 timeout) {
-    int old;
     struct thd_cb *newcb;
 
     /* Allocate space for the new callback and set it up. */
@@ -73,33 +72,30 @@ int net_thd_add_callback(void (*cb)(void *), void *data, uint64 timeout) {
     newcb->nextrun = timer_ms_gettime64() + timeout;
 
     /* Disable interrupts, insert, and re-enable interrupts */
-    old = irq_disable();
+    irq_disable_scoped();
+
     TAILQ_INSERT_TAIL(&cbs, newcb, thds);
-    irq_restore(old);
 
     return newcb->cbid;
 }
 
 int net_thd_del_callback(int cbid) {
-    int old;
     struct thd_cb *cb;
 
     /* Disable interrupts so we can search without fear of anything changing
        underneath us. */
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* See if we can find the callback requested. */
     TAILQ_FOREACH(cb, &cbs, thds) {
         if(cb->cbid == cbid) {
             TAILQ_REMOVE(&cbs, cb, thds);
             free(cb);
-            irq_restore(old);
             return 0;
         }
     }
 
     /* We didn't find it, punt. */
-    irq_restore(old);
     return -1;
 }
 
diff --git a/kernel/thread/cond.c b/kernel/thread/cond.c
index 979b317f..dc8ffa01 100644
--- a/kernel/thread/cond.c
+++ b/kernel/thread/cond.c
@@ -58,7 +58,7 @@ int cond_destroy(condvar_t *cv) {
 }
 
 int cond_wait_timed(condvar_t *cv, mutex_t *m, int timeout) {
-    int old, rv;
+    int rv;
 
     if(irq_inside_int()) {
         dbglog(DBG_WARNING, "cond_wait: called inside interrupt\n");
@@ -66,12 +66,11 @@ int cond_wait_timed(condvar_t *cv, mutex_t *m, int timeout) {
         return -1;
     }
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     if(m->type < MUTEX_TYPE_NORMAL || m->type > MUTEX_TYPE_RECURSIVE ||
        !mutex_is_locked(m)) {
         errno = EINVAL;
-        irq_restore(old);
         return -1;
     }
 
@@ -88,9 +87,6 @@ int cond_wait_timed(condvar_t *cv, mutex_t *m, int timeout) {
     /* Re-lock our mutex */
     mutex_lock(m);
 
-    /* Ok, ready to return */
-    irq_restore(old);
-
     return rv;
 }
 
@@ -99,27 +95,19 @@ int cond_wait(condvar_t *cv, mutex_t *m) {
 }
 
 int cond_signal(condvar_t *cv) {
-    int old, rv = 0;
-
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Wake one thread who's waiting, if any */
     genwait_wake_one(cv);
 
-    irq_restore(old);
-
-    return rv;
+    return 0;
 }
 
 int cond_broadcast(condvar_t *cv) {
-    int old, rv = 0;
-
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Wake all threads who are waiting */
     genwait_wake_all(cv);
 
-    irq_restore(old);
-
-    return rv;
+    return 0;
 }
diff --git a/kernel/thread/genwait.c b/kernel/thread/genwait.c
index da50dbb2..b5c8fa4f 100644
--- a/kernel/thread/genwait.c
+++ b/kernel/thread/genwait.c
@@ -68,7 +68,6 @@ static kthread_t * tq_next(void) {
 }
 
 int genwait_wait(void * obj, const char * mesg, int timeout, void (*callback)(void *)) {
-    int     old, rv;
     kthread_t   * me;
 
     /* Twiddle interrupt state */
@@ -77,7 +76,7 @@ int genwait_wait(void * obj, const char * mesg, int timeout, void (*callback)(vo
         return -1;
     }
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Prepare us for sleep */
     me = thd_current;
@@ -99,11 +98,7 @@ int genwait_wait(void * obj, const char * mesg, int timeout, void (*callback)(vo
     TAILQ_INSERT_TAIL(&slpque[LOOKUP(obj)], me, thdq);
 
     /* Block us until we're signaled */
-    rv = thd_block_now(&me->context);
-
-    irq_restore(old);
-
-    return rv;
+    return thd_block_now(&me->context);
 }
 
 /* Removes a thread from its wait queue; assumes ints are disabled. */
@@ -131,10 +126,10 @@ static void genwait_unqueue(kthread_t * thd) {
 int genwait_wake_cnt(void * obj, int cntmax, int err) {
     kthread_t       * t, * nt;
     struct slpquehead   * qp;
-    int         cnt, old;
+    int         cnt;
 
     /* Twiddle interrupt state */
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Find the queue */
     qp = &slpque[LOOKUP(obj)];
@@ -168,9 +163,6 @@ int genwait_wake_cnt(void * obj, int cntmax, int err) {
         }
     }
 
-    /* Re-fix IRQs */
-    irq_restore(old);
-
     return cnt;
 }
 
@@ -193,10 +185,9 @@ void genwait_wake_all_err(void *obj, int err) {
 int genwait_wake_thd(void *obj, kthread_t *thd, int err) {
     kthread_t *t, *nt;
     struct slpquehead *qp;
-    int old, rv = 0;
 
     /* Twiddle interrupt state */
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* Find the queue */
     qp = &slpque[LOOKUP(obj)];
@@ -221,15 +212,11 @@ int genwait_wake_thd(void *obj, kthread_t *thd, int err) {
             }
 
             /* We found it, so we're done... */
-            rv = 1;
-            break;
+	    return 1;
         }
     }
 
-    /* Re-fix IRQs */
-    irq_restore(old);
-
-    return rv;
+    return 0;
 }
 
 void genwait_check_timeouts(uint64 tm) {
diff --git a/kernel/thread/mutex.c b/kernel/thread/mutex.c
index c8f84735..38abc2ed 100644
--- a/kernel/thread/mutex.c
+++ b/kernel/thread/mutex.c
@@ -52,31 +52,28 @@ int mutex_init(mutex_t *m, int mtype) {
 }
 
 int mutex_destroy(mutex_t *m) {
-    int rv = 0, old;
-
-    old = irq_disable();
+    irq_disable_scoped();
 
     if(m->type < MUTEX_TYPE_NORMAL || m->type > MUTEX_TYPE_RECURSIVE) {
         errno = EINVAL;
-        rv = -1;
+        return -1;
     }
-    else if(m->count) {
+
+    if(m->count) {
         /* Send an error if its busy */
         errno = EBUSY;
-        rv = -1;
-    }
-    else {
-        /* Set it to an invalid type of mutex */
-        m->type = -1;
+        return -1;
     }
 
+    /* Set it to an invalid type of mutex */
+    m->type = -1;
+
     /* If the mutex was created with the deprecated mutex_create(), free it. */
     if(m->dynamic) {
         free(m);
     }
 
-    irq_restore(old);
-    return rv;
+    return 0;
 }
 
 int mutex_lock(mutex_t *m) {
@@ -92,7 +89,7 @@ int mutex_lock_irqsafe(mutex_t *m) {
 
 int mutex_lock_timed(mutex_t *m, int timeout) {
     uint64_t deadline = 0;
-    int old, rv = 0;
+    int rv = 0;
 
     if((rv = irq_inside_int())) {
         dbglog(DBG_WARNING, "%s: called inside an interrupt with code: "
@@ -108,7 +105,7 @@ int mutex_lock_timed(mutex_t *m, int timeout) {
         return -1;
     }
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     if(m->type < MUTEX_TYPE_NORMAL || m->type > MUTEX_TYPE_RECURSIVE) {
         errno = EINVAL;
@@ -160,7 +157,6 @@ int mutex_lock_timed(mutex_t *m, int timeout) {
         }
     }
 
-    irq_restore(old);
     return rv;
 }
 
@@ -169,10 +165,9 @@ int mutex_is_locked(mutex_t *m) {
 }
 
 int mutex_trylock(mutex_t *m) {
-    int old, rv = 0;
     kthread_t *thd = thd_current;
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     /* If we're inside of an interrupt, pick a special value for the thread that
        would otherwise be impossible... */
@@ -181,49 +176,46 @@ int mutex_trylock(mutex_t *m) {
 
     if(m->type < MUTEX_TYPE_NORMAL || m->type > MUTEX_TYPE_RECURSIVE) {
         errno = EINVAL;
-        rv = -1;
+        return -1;
     }
+
     /* Check if the lock is held by some other thread already */
-    else if(m->count && m->holder != thd) {
+    if(m->count && m->holder != thd) {
         errno = EAGAIN;
-        rv = -1;
+        return -1;
     }
-    else {
-        m->holder = thd;
-
-        switch(m->type) {
-            case MUTEX_TYPE_NORMAL:
-            case MUTEX_TYPE_OLDNORMAL:
-            case MUTEX_TYPE_ERRORCHECK:
-                if(m->count) {
-                    errno = EDEADLK;
-                    rv = -1;
-                }
-                else {
-                    m->count = 1;
-                }
-                break;
 
-            case MUTEX_TYPE_RECURSIVE:
-                if(m->count == INT_MAX) {
-                    errno = EAGAIN;
-                    rv = -1;
-                }
-                else {
-                    ++m->count;
-                }
-                break;
-        }
+    m->holder = thd;
+
+    switch(m->type) {
+        case MUTEX_TYPE_NORMAL:
+        case MUTEX_TYPE_OLDNORMAL:
+        case MUTEX_TYPE_ERRORCHECK:
+            if(m->count) {
+                errno = EDEADLK;
+                return -1;
+            }
+
+            m->count = 1;
+            break;
+
+        case MUTEX_TYPE_RECURSIVE:
+            if(m->count == INT_MAX) {
+                errno = EAGAIN;
+                return -1;
+            }
+
+            ++m->count;
+            break;
     }
 
-    irq_restore(old);
-    return rv;
+    return 0;
 }
 
 static int mutex_unlock_common(mutex_t *m, kthread_t *thd) {
-    int old, rv = 0, wakeup = 0;
+    int wakeup = 0;
 
-    old = irq_disable();
+    irq_disable_scoped();
 
     switch(m->type) {
         case MUTEX_TYPE_NORMAL:
@@ -236,21 +228,21 @@ static int mutex_unlock_common(mutex_t *m, kthread_t *thd) {
         case MUTEX_TYPE_ERRORCHECK:
             if(m->holder != thd) {
                 errno = EPERM;
-                rv = -1;
-            }
...<truncated>...


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A pseudo Operating System for the Dreamcast.




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cadcdev-svn-commits Mailing List for Cryptic Allusion DCDev (Page 7)

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