149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*
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* System-dependent scheduler support
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*
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* Copyright 1998 Alexandre Julliard
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*/
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/* Get pointers to the static errno and h_errno variables used by Xlib. This
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must be done before including <errno.h> makes the variables invisible. */
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extern int errno;
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static int *perrno = &errno;
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extern int h_errno;
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static int *ph_errno = &h_errno;
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "thread.h"
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#include "server.h"
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#include "winbase.h"
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#include "debug.h"
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/* Xlib critical section (FIXME: does not belong here) */
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CRITICAL_SECTION X11DRV_CritSection = { 0, };
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#ifdef HAVE_CLONE_SYSCALL
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# ifdef HAVE_SCHED_H
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# include <sched.h>
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# endif
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# ifndef CLONE_VM
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# define CLONE_VM 0x00000100
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# define CLONE_FS 0x00000200
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# define CLONE_FILES 0x00000400
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# define CLONE_SIGHAND 0x00000800
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# define CLONE_PID 0x00001000
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/* If we didn't get the flags, we probably didn't get the prototype either */
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extern int clone( int (*fn)(void *arg), void *stack, int flags, void *arg );
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# endif /* CLONE_VM */
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#endif /* HAVE_CLONE_SYSCALL */
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#ifdef USE_THREADS
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/***********************************************************************
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* __errno_location
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*
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* Get the per-thread errno location.
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*/
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int *__errno_location()
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{
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THDB *thdb = THREAD_Current();
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if (!thdb) return perrno;
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#ifdef NO_REENTRANT_X11
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/* Use static libc errno while running in Xlib. */
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if (X11DRV_CritSection.OwningThread == thdb->server_tid)
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return perrno;
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#endif
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return &thdb->thread_errno;
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}
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/***********************************************************************
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* __h_errno_location
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*
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* Get the per-thread h_errno location.
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*/
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int *__h_errno_location()
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{
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THDB *thdb = THREAD_Current();
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if (!thdb) return ph_errno;
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#ifdef NO_REENTRANT_X11
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/* Use static libc h_errno while running in Xlib. */
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if (X11DRV_CritSection.OwningThread == thdb->server_tid)
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return ph_errno;
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#endif
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return &thdb->thread_h_errno;
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}
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/***********************************************************************
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* SYSDEPS_StartThread
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*
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* Startup routine for a new thread.
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*/
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static void SYSDEPS_StartThread( THDB *thdb )
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{
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SET_FS( thdb->teb_sel );
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THREAD_Start( thdb );
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}
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#endif /* USE_THREADS */
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/***********************************************************************
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* SYSDEPS_SpawnThread
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*
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* Start running a new thread.
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* Return -1 on error, 0 if OK.
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*/
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int SYSDEPS_SpawnThread( THDB *thread )
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{
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#ifdef USE_THREADS
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#ifdef HAVE_CLONE_SYSCALL
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if (clone( (int (*)(void *))SYSDEPS_StartThread, thread->teb.stack_top,
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CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, thread ) < 0)
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return -1;
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/* FIXME: close the child socket in the parent process */
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/* close( thread->socket );*/
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#endif
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#ifdef HAVE_RFORK
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FIXME(thread, "Threads using rfork() not implemented\n" );
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#endif
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#else /* !USE_THREADS */
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FIXME(thread, "CreateThread: stub\n" );
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#endif /* USE_THREADS */
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return 0;
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}
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/***********************************************************************
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* SYSDEPS_ExitThread
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*
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* Exit a running thread; must not return.
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* Must not make any reference to the thread structures (THDB etc.) as
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* they have already been deleted.
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*/
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void SYSDEPS_ExitThread(void)
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{
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_exit( 0 );
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}
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/**********************************************************************
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* NtCurrentTeb (NTDLL.89)
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*
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* This will crash and burn if called before threading is initialized
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*/
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TEB * WINAPI NtCurrentTeb(void)
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{
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#ifdef __i386__
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TEB *teb;
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/* Get the TEB self-pointer */
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__asm__( ".byte 0x64\n\tmovl (%1),%0"
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: "=r" (teb) : "r" (&((TEB *)0)->self) );
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return teb;
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#else
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return &pCurrentThread->teb;
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#endif /* __i386__ */
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}
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