github
diff --git a/‎include/ruby/fiber/scheduler.h
Lines changed: 1 addition & 1 deletion b/‎include/ruby/fiber/scheduler.h
Lines changed: 1 addition & 1 deletion
diff --git a/‎include/ruby/io/buffer.h
Lines changed: 15 additions & 2 deletions b/‎include/ruby/io/buffer.h
Lines changed: 15 additions & 2 deletions
@@ -97,7 +97,7 @@ VALUE rb_fiber_scheduler_get(void);
  * current  thread  will  call  scheduler's  `#close`  method  on  finalisation
  * (allowing  the  scheduler  to  properly  manage  all  non-finished  fibers).
  * `scheduler`   can   be   an   object   of   any   class   corresponding   to
- * `Fiber::SchedulerInterface`. Its implementation is up to the user.
+ * `Fiber::Scheduler` interface. Its implementation is up to the user.
  *
  * @param[in]  scheduler     The scheduler to set.
  * @exception  rb_eArgError  `scheduler` does not conform the interface.
 
@@ -23,10 +23,18 @@ RBIMPL_SYMBOL_EXPORT_BEGIN()
 
 #define RUBY_IO_BUFFER_VERSION 2
 
+// The `IO::Buffer` class.
 RUBY_EXTERN VALUE rb_cIOBuffer;
+
+// The operating system page size.
 RUBY_EXTERN size_t RUBY_IO_BUFFER_PAGE_SIZE;
+
+// The default buffer size, usually a (small) multiple of the page size.
+// Can be overridden by the RUBY_IO_BUFFER_DEFAULT_SIZE environment variable.
 RUBY_EXTERN size_t RUBY_IO_BUFFER_DEFAULT_SIZE;
 
+// Represents the internal state of the buffer.
+// More than one flag can be set at a time.
 enum rb_io_buffer_flags {
     // The memory in the buffer is owned by someone else.
     // More specifically, it means that someone else owns the buffer and we shouldn't try to resize it.
@@ -49,10 +57,12 @@ enum rb_io_buffer_flags {
     RB_IO_BUFFER_PRIVATE = 64,
 
     // The buffer is read-only and cannot be modified.
-    RB_IO_BUFFER_READONLY = 128
+    RB_IO_BUFFER_READONLY = 128,
 };
 
+// Represents the endian of the data types.
 enum rb_io_buffer_endian {
+    // The least significant units are put first.
     RB_IO_BUFFER_LITTLE_ENDIAN = 4,
     RB_IO_BUFFER_BIG_ENDIAN = 8,
 
@@ -79,7 +89,10 @@ int rb_io_buffer_try_unlock(VALUE self);
 VALUE rb_io_buffer_free(VALUE self);
 VALUE rb_io_buffer_free_locked(VALUE self);
 
-int rb_io_buffer_get_bytes(VALUE self, void **base, size_t *size);
+// Access the internal buffer and flags. Validates the pointers.
+// The points may not remain valid if the source buffer is manipulated.
+// Consider using rb_io_buffer_lock if needed.
+enum rb_io_buffer_flags rb_io_buffer_get_bytes(VALUE self, void **base, size_t *size);
 void rb_io_buffer_get_bytes_for_reading(VALUE self, const void **base, size_t *size);
 void rb_io_buffer_get_bytes_for_writing(VALUE self, void **base, size_t *size);
Original file line number	Diff line number	Diff line change
`@@ -97,7 +97,7 @@ VALUE rb_fiber_scheduler_get(void);`
`97`	`97`	* current thread will call scheduler's `#close` method on finalisation
`98`	`98`	`* (allowing the scheduler to properly manage all non-finished fibers).`
`99`	`99`	* `scheduler` can be an object of any class corresponding to
`100`		- * `Fiber::SchedulerInterface`. Its implementation is up to the user.
	`100`	+ * `Fiber::Scheduler` interface. Its implementation is up to the user.
`101`	`101`	`*`
`102`	`102`	`* @param[in] scheduler The scheduler to set.`
`103`	`103`	* @exception rb_eArgError `scheduler` does not conform the interface.