Changes in libcfa/src/concurrency/io/setup.cfa [ec19b21:bb58825]

File:

• libcfa/src/concurrency/io/setup.cfa (modified) (3 diffs)

libcfa/src/concurrency/io/setup.cfa

@@ -314 +314 @@
         }
 
+        extern void signal_block( int sig );
+        extern void signal_unblock( int sig );
+
         static void __io_create( __io_data & this, const io_context_params & params_in ) {
                 // Step 1 : call to setup
@@ -398 +401 @@
                         const __u32 num = *sq.num;
                         for( i; num ) {
-                                __sqe_clean( &sq.sqes[i] );
+                                sq.sqes[i].opcode = IORING_OP_LAST;
+                                sq.sqes[i].user_data = 3ul64;
                         }
                 }
@@ -429 +433 @@
 
                 // Step 4 : eventfd
-                int efd;
-                for() {
-                        efd = eventfd(0, 0);
-                        if (efd < 0) {
-                                if (errno == EINTR) continue;
-                                abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno));
-                        }
-                        break;
-                }
-
-                int ret;
-                for() {
-                        ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1);
-                        if (ret < 0) {
-                                if (errno == EINTR) continue;
-                                abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
-                        }
-                        break;
-                }
+                // io_uring_register is so f*cking slow on some machine that it
+                // will never succeed if preemption isn't hard blocked
+                signal_block( SIGUSR1 );
+
+                int efd = eventfd(0, 0);
+                if (efd < 0) {
+                        abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno));
+                }
+
+                int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1);
+                if (ret < 0) {
+                        abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
+                }
+
+                signal_unblock( SIGUSR1 );
 
                 // some paranoid checks