Changeset a55d76b1 in mainline for uspace/lib/c/include/fibril_synch.h

Timestamp:

2018-06-13T17:07:58Z (6 years ago)

Author:

Jiří Zárevúcky <jiri.zarevucky@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

be2a20ac, c407b98

Parents:

899342e

git-author:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-13 17:04:01)

git-committer:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-06-13 17:07:58)

Message:

Implement a simple counting semaphore for fibrils.

File:

• uspace/lib/c/include/fibril_synch.h (modified) (2 diffs)

uspace/lib/c/include/fibril_synch.h

@@ -143 +143 @@
 } fibril_timer_t;
 
+/** A counting semaphore for fibrils. */
+typedef struct {
+        long count;
+        list_t waiters;
+} fibril_semaphore_t;
+
+#define FIBRIL_SEMAPHORE_INITIALIZER(name, cnt) \
+        { \
+                .count = (cnt), \
+                .waiters = { \
+                        .head = { \
+                                .next = &(name).waiters.head, \
+                                .prev = &(name).waiters.head, \
+                        } \
+                } \
+        }
+
+#define FIBRIL_SEMAPHORE_INITIALIZE(name, cnt) \
+        fibril_semaphore_t name = FIBRIL_SEMAPHORE_INITIALIZER(name, cnt)
+
 extern void fibril_mutex_initialize(fibril_mutex_t *);
 extern void fibril_mutex_lock(fibril_mutex_t *);
@@ -174 +194 @@
 extern fibril_timer_state_t fibril_timer_clear_locked(fibril_timer_t *);
 
+extern void fibril_semaphore_initialize(fibril_semaphore_t *, long);
+extern void fibril_semaphore_up(fibril_semaphore_t *);
+extern void fibril_semaphore_down(fibril_semaphore_t *);
+
 #endif