expose max number of concurrent threads to users

+ Can be used to build fast hashmaps to speed up ipc

2 files changed, 14 insertions, 0 deletions

diff --git a/include/kmi/syscalls.h b/include/kmi/syscalls.h
index 5079d74..4319812 100644
--- a/include/kmi/syscalls.h
+++ b/include/kmi/syscalls.h
@@ -258,6 +258,15 @@ enum conf_param {
 	 * \c R
 	 */
 	CONF_PAGE_SIZE,
+
+	/**
+	 * Maximum number of threads active at the same time.
+	 * Can be used by userspace to build a pretty fast hashmaps of thread
+	 * IDs to whatever, see \ref get_tcb().
+	 * Guaranteed to be some power of 2.
+	 * \c R
+	 */
+	CONF_MAX_THREADS,
 };
 
 /** Capabilities of process. */
diff --git a/include/kmi/tcb.h b/include/kmi/tcb.h
index a6522f8..4214cb0 100644
--- a/include/kmi/tcb.h
+++ b/include/kmi/tcb.h
@@ -199,6 +199,11 @@ struct tcb {
 void init_tcbs();
 
 /**
+ * @return Maximum number of threads active at the same time.
+ */
+size_t max_tcbs();
+
+/**
  * Destroy thread control subsystem.
  */
 void destroy_tcbs();