1 files changed, 27 insertions, 6 deletions
diff --git a/internal/io.h b/internal/io.h
index b4efa174a1..2110f0b087 100644
--- a/internal/io.h
+++ b/internal/io.h
@@ -14,10 +14,21 @@
 struct rb_io;
 
 #include "ruby/io.h"            /* for rb_io_t */
+#include "ccan/list/list.h"
+#include "serial.h"
 
 #define IO_WITHOUT_GVL(func, arg) rb_nogvl(func, arg, RUBY_UBF_IO, 0, RB_NOGVL_OFFLOAD_SAFE)
 #define IO_WITHOUT_GVL_INT(func, arg) (int)(VALUE)IO_WITHOUT_GVL(func, arg)
 
+// Represents an in-flight blocking operation:
+struct rb_io_blocking_operation {
+    // The linked list data structure.
+    struct ccan_list_node list;
+
+    // The execution context of the blocking operation.
+    struct rb_execution_context_struct *ec;
+};
+
 /** Ruby's IO, metadata and buffers. */
 struct rb_io {
 
@@ -31,7 +42,7 @@ struct rb_io {
     int fd;
 
     /** mode flags: FMODE_XXXs */
-    int mode;
+    enum rb_io_mode mode;
 
     /** child's pid (for pipes) */
     rb_pid_t pid;
@@ -111,6 +122,18 @@ struct rb_io {
      * The timeout associated with this IO when performing blocking operations.
      */
     VALUE timeout;
+
+    /**
+     * Threads that are performing a blocking operation without the GVL using
+     * this IO. On calling IO#close, these threads will be interrupted so that
+     * the operation can be cancelled.
+     */
+    struct ccan_list_head blocking_operations;
+    struct rb_execution_context_struct *closing_ec;
+    VALUE wakeup_mutex;
+
+    // The fork generation of the blocking operations list.
+    rb_serial_t fork_generation;
 };
 
 /* io.c */
@@ -119,17 +142,15 @@ void rb_stdio_set_default_encoding(void);
 VALUE rb_io_flush_raw(VALUE, int);
 size_t rb_io_memsize(const rb_io_t *);
 int rb_stderr_tty_p(void);
-void rb_io_fptr_finalize_internal(void *ptr);
-#ifdef rb_io_fptr_finalize
-# undef rb_io_fptr_finalize
-#endif
-#define rb_io_fptr_finalize rb_io_fptr_finalize_internal
 VALUE rb_io_popen(VALUE pname, VALUE pmode, VALUE env, VALUE opt);
 
 VALUE rb_io_prep_stdin(void);
 VALUE rb_io_prep_stdout(void);
 VALUE rb_io_prep_stderr(void);
 
+int rb_io_notify_close(struct rb_io *fptr);
+bool rb_io_fptr_finalize_closed(struct rb_io *fptr);
+
 RUBY_SYMBOL_EXPORT_BEGIN
 /* io.c (export) */
 void rb_maygvl_fd_fix_cloexec(int fd);