f730a9c343
Setting the handler for SIGCHLD to SIG_IGN (ignore) informs the kernel not to enter the zombie state: (man 2 wait) POSIX.1-2001 specifies that if the disposition of SIGCHLD is set to SIG_IGN or the SA_NOCLDWAIT flag is set for SIGCHLD (see sigaction(2)), then children that terminate do not become zombies [...] Fixes #271.
61 lines
1.2 KiB
C++
61 lines
1.2 KiB
C++
/*
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* \brief Implementation of the core-internal Thread API via Linux threads
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* \author Norman Feske
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* \date 2006-06-13
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*/
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/*
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* Copyright (C) 2006-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/thread.h>
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#include <base/sleep.h>
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/* Linux syscall bindings */
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#include <linux_syscalls.h>
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using namespace Genode;
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static void empty_signal_handler(int) { }
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static void thread_start(void *)
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{
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/*
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* Set signal handler such that canceled system calls get not
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* transparently retried after a signal gets received.
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*/
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lx_sigaction(LX_SIGUSR1, empty_signal_handler);
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/*
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* Prevent children from becoming zombies. (SIG_IGN = 1)
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*/
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lx_sigaction(LX_SIGCHLD, (void (*)(int))1);
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Thread_base::myself()->entry();
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sleep_forever();
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}
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void Thread_base::_init_platform_thread() { }
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void Thread_base::_deinit_platform_thread() { }
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void Thread_base::start()
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{
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/* align initial stack to 16 byte boundary */
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void *thread_sp = (void *)((addr_t)(_context->stack) & ~0xf);
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_tid.tid = lx_create_thread(thread_start, thread_sp, this);
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_tid.pid = lx_getpid();
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}
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void Thread_base::cancel_blocking() { }
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