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-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)