81338031c4
The reasons: 1. Get rid of the stubs/quirks with process dethreading, process reparent when the process group leader exits and close to this problems on wait(), waitpid(), etc. 2. Reuse our kernel code instead of writing excessive thread managment routines in Linuxulator. Implementation details: 1. The thread is created via kern_thr_new() in the clone() call with the CLONE_THREAD parameter. Thus, everything else is a process. 2. The test that the process has a threads is done via P_HADTHREADS bit p_flag of struct proc. 3. Per thread emulator state data structure is now located in the struct thread and freed in the thread_dtor() hook. Mandatory holdig of the p_mtx required when referencing emuldata from the other threads. 4. PID mangling has changed. Now Linux pid is the native tid and Linux tgid is the native pid, with the exception of the first thread in the process where tid and pid are one and the same. Ugliness: In case when the Linux thread is the initial thread in the thread group thread id is equal to the process id. Glibc depends on this magic (assert in pthread_getattr_np.c). So for system calls that take thread id as a parameter we should use the special method to reference struct thread. Differential Revision: https://reviews.freebsd.org/D1039
65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
/*-
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* Copyright (c) 2006 Roman Divacky
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* Copyright (c) 2013 Dmitry Chagin
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_EMUL_H_
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#define _LINUX_EMUL_H_
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/*
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* modeled after similar structure in NetBSD
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* this will be extended as we need more functionality
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*/
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struct linux_emuldata {
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int *child_set_tid; /* in clone(): Child's TID to set on clone */
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int *child_clear_tid;/* in clone(): Child's TID to clear on exit */
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int pdeath_signal; /* parent death signal */
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int flags; /* different emuldata flags */
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int em_tid; /* thread id */
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struct linux_robust_list_head *robust_futexes;
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};
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struct linux_emuldata *em_find(struct thread *);
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/* emuldata flags */
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#define LINUX_XDEPR_REQUEUEOP 0x00000001 /* uses deprecated
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futex REQUEUE op*/
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void linux_proc_init(struct thread *, struct thread *, int);
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void linux_proc_exit(void *, struct proc *);
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void linux_schedtail(struct thread *);
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void linux_proc_exec(void *, struct proc *, struct image_params *);
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void linux_thread_dtor(void *arg __unused, struct thread *);
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void linux_thread_detach(struct thread *);
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int linux_common_execve(struct thread *, struct image_args *);
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#endif /* !_LINUX_EMUL_H_ */
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