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authorMarius Vollmer <mvo@zagadka.de>2005-03-07 21:30:24 +0000
committerMarius Vollmer <mvo@zagadka.de>2005-03-07 21:30:24 +0000
commita4d106c70e87ee8e5d8aa3a0e3d44218703f1d04 (patch)
treeeb02997854fc4c04e16254b1091b5645daafe355 /libguile/async.h
parent673ba2da04c2495f905b9e47c2ee820a605aef64 (diff)
downloadguile-a4d106c70e87ee8e5d8aa3a0e3d44218703f1d04.tar.gz
* threads.h, async.h, threads.c (SCM_CRITICAL_SECTION_START,
SCM_CRITICAL_SECTION_END): Moved here from threads.h since now they also block/unblock execution of asyncs and call scm_async_click which is declared in async.h but threads.h can not include async.h since async.h already includes threads.h. (scm_i_critical_section_level): New, for checking mistakes in the use of the SCM_CRITICAL_SECTION_* macros. (scm_i_critical_section_mutex): Make it a recursive mutex so that critical sections can be nested. * threads.h, threads.c (scm_frame_lock_mutex): New. (scm_frame_critical_section): Take mutex as argument. (framed_critical_section_mutex): New, used as default for above. (scm_init_threads): Initialize it. (scm_threads_prehistory): Do not initialize thread_admin_mutex and scm_i_critical_section_mutex; both are initialized statically.
Diffstat (limited to 'libguile/async.h')
-rw-r--r--libguile/async.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/libguile/async.h b/libguile/async.h
index fca230382..e6d71520e 100644
--- a/libguile/async.h
+++ b/libguile/async.h
@@ -51,6 +51,32 @@ void *scm_c_call_with_unblocked_asyncs (void *(*p) (void *d), void *d);
void scm_frame_block_asyncs (void);
void scm_frame_unblock_asyncs (void);
+/* Critical sections */
+
+/* XXX - every critical section needs to be examined whether the
+ requirements for SCM_CRITICAL_SECTION_START/END are fulfilled. See
+ the manual.
+*/
+
+/* Defined in threads.c. scm_i_critical_section_level is only used
+ for error checking and will go away eventually. */
+extern scm_i_pthread_mutex_t scm_i_critical_section_mutex;
+extern int scm_i_critical_section_level;
+
+#define SCM_CRITICAL_SECTION_START \
+ do { \
+ scm_i_pthread_mutex_lock (&scm_i_critical_section_mutex);\
+ SCM_I_CURRENT_THREAD->block_asyncs++; \
+ scm_i_critical_section_level++; \
+ } while (0)
+#define SCM_CRITICAL_SECTION_END \
+ do { \
+ scm_i_critical_section_level--; \
+ SCM_I_CURRENT_THREAD->block_asyncs--; \
+ scm_i_pthread_mutex_unlock (&scm_i_critical_section_mutex); \
+ scm_async_click (); \
+ } while (0)
+
SCM_API void scm_init_async (void);
#if (SCM_ENABLE_DEPRECATED == 1)