From 6c9ee23acc144ec10f869bbd9b872379224a8938 Mon Sep 17 00:00:00 2001 From: jb Date: Wed, 29 Apr 1998 09:59:34 +0000 Subject: Change signal model to match POSIX (i.e. one set of signal handlers for the process, not a separate set for each thread). By default, the process now only has signal handlers installed for SIGVTALRM, SIGINFO and SIGCHLD. The thread kernel signal handler is installed for other signals on demand. This means that SIG_IGN and SIG_DFL processing is now left to the kernel, not the thread kernel. Change the signal dispatch to no longer use a signal thread, and call the signal handler using the stack of the thread that has the signal pending. Change the atomic lock method to use test-and-set asm code with a yield if blocked. This introduces separate locks for each type of object instead of blocking signals to prevent a context switch. It was this blocking of signals that caused the performance degradation the people have noted. This is a *big* change! --- lib/libc_r/uthread/uthread_sendto.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'lib/libc_r/uthread/uthread_sendto.c') diff --git a/lib/libc_r/uthread/uthread_sendto.c b/lib/libc_r/uthread/uthread_sendto.c index c7155c8..afac661 100644 --- a/lib/libc_r/uthread/uthread_sendto.c +++ b/lib/libc_r/uthread/uthread_sendto.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 1995 John Birrell . + * Copyright (c) 1995-1998 John Birrell * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -50,7 +50,15 @@ sendto(int fd, const void *msg, size_t len, int flags, const struct sockaddr * t /* Set the timeout: */ _thread_kern_set_timeout(NULL); + _thread_run->interrupted = 0; _thread_kern_sched_state(PS_FDW_WAIT, __FILE__, __LINE__); + + /* Check if the operation was interrupted: */ + if (_thread_run->interrupted) { + errno = EINTR; + ret = -1; + break; + } } else { ret = -1; break; -- cgit v1.1