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
83 lines
3.4 KiB
C
83 lines
3.4 KiB
C
/* $NetBSD: linux_futex.h,v 1.2 2005/12/11 12:20:19 christos Exp $ */
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/*-
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* Copyright (c) 2005 Emmanuel Dreyfus, 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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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Emmanuel Dreyfus
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* 4. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_FUTEX_H
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#define _LINUX_FUTEX_H
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extern LIST_HEAD(futex_list, futex) futex_list;
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extern struct mtx futex_mtx;
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#define LINUX_FUTEX_WAIT 0
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#define LINUX_FUTEX_WAKE 1
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#define LINUX_FUTEX_FD 2 /* unused */
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#define LINUX_FUTEX_REQUEUE 3
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#define LINUX_FUTEX_CMP_REQUEUE 4
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#define LINUX_FUTEX_WAKE_OP 5
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#define LINUX_FUTEX_LOCK_PI 6
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#define LINUX_FUTEX_UNLOCK_PI 7
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#define LINUX_FUTEX_TRYLOCK_PI 8
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#define LINUX_FUTEX_WAIT_BITSET 9
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#define LINUX_FUTEX_WAKE_BITSET 10
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#define LINUX_FUTEX_WAIT_REQUEUE_PI 11
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#define LINUX_FUTEX_CMP_REQUEUE_PI 12
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#define LINUX_FUTEX_PRIVATE_FLAG 128
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#define LINUX_FUTEX_CLOCK_REALTIME 256
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#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
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#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */
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#define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */
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#define FUTEX_OP_ANDN 3 /* *(int *)UADDR2 &= ~OPARG; */
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#define FUTEX_OP_XOR 4 /* *(int *)UADDR2 ^= OPARG; */
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#define FUTEX_OP_OPARG_SHIFT 8 /* Use (1 << OPARG) instead of OPARG. */
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#define FUTEX_OP_CMP_EQ 0 /* if (oldval == CMPARG) wake */
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#define FUTEX_OP_CMP_NE 1 /* if (oldval != CMPARG) wake */
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#define FUTEX_OP_CMP_LT 2 /* if (oldval < CMPARG) wake */
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#define FUTEX_OP_CMP_LE 3 /* if (oldval <= CMPARG) wake */
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#define FUTEX_OP_CMP_GT 4 /* if (oldval > CMPARG) wake */
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#define FUTEX_OP_CMP_GE 5 /* if (oldval >= CMPARG) wake */
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#define FUTEX_WAITERS 0x80000000
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#define FUTEX_OWNER_DIED 0x40000000
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#define FUTEX_TID_MASK 0x3fffffff
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#define FUTEX_BITSET_MATCH_ANY 0xffffffff
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void release_futexes(struct thread *,
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struct linux_emuldata *);
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#endif /* !_LINUX_FUTEX_H */
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