Mercurial > sdl-ios-xcode
view src/thread/linux/clone.S @ 1258:b2283b0ded26
Date: Thu, 19 Jan 2006 20:02:29 +0200
From: Vassilis Virvilis <vasvir@iit.demokritos.gr>
Subject: [SDL] Request: Please reconsider adding tag in SDL_Event
Hi,
Patch in question:
--- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11
+++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000
@@ -214,7 +214,7 @@
} SDL_SysWMEvent;
/* General event structure */
-typedef union {
+typedef union SDL_Event {
Uint8 type;
SDL_ActiveEvent active;
SDL_KeyboardEvent key;
Reasoning:
----------
1) Allows forward declaration of the SDL_Event union in C++. Please
note that in plain C it is possible to forward declare it.
2) Forward declaration is good because it allows encapsulation. It hides
the specific implementation and does not necessarily exposes SDL staff
to my appication's namespace
3) It can't harm plain C because tags are living in a different namespace
than typenames
4) It is already done like this in other places in SDL. Check for example
SDL_KeySym, and SDL_.*Event structures.
5) Right now I have to include SDL/event.h from a C++ header file. See 2)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 20 Jan 2006 13:07:25 +0000 |
| parents | 974ba6ae0fa3 |
| children | c9b51268668f |
line wrap: on
line source
/* Taken with thanks from LinuxThreads 0.6 */ /* This is no longer necessary with glibc-2.1, which has its own clone() */ #ifdef linux /* Look to see if glibc is available, and if so, what version */ #include <features.h> #if (__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1)) #define HAVE_CLONE #endif /* glibc 2.1 or newer */ #endif /* linux */ #if defined(linux) && !defined(SDL_USE_PTHREADS) && !defined(HAVE_CLONE) #if defined(__i386__) /************************************************************************/ /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. Contributed by Richard Henderson (rth@tamu.edu) The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif Cambridge, MA 02139, USA. */ /* clone() is even more special than fork() as it mucks with stacks and invokes a function in the right context after its all over. */ #include <asm/errno.h> #include <asm/unistd.h> /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ .text .align 4 .globl __clone .type __clone,@function .weak clone clone = __clone __clone: /* Sanity check arguments. */ movl $-EINVAL,%eax movl 4(%esp),%ecx /* no NULL function pointers */ testl %ecx,%ecx jz syscall_error movl 8(%esp),%ecx /* no NULL stack pointers */ testl %ecx,%ecx jz syscall_error /* Insert the argument onto the new stack. */ subl $8,%ecx movl 16(%esp),%eax movl %eax,4(%ecx) /* Save the function pointer as the zeroth argument. */ /* It will be popped off in the child in the ebx frobbing below. */ movl 4(%esp),%eax movl %eax,0(%ecx) /* Do the system call */ pushl %ebx movl 16(%esp),%ebx movl $__NR_clone,%eax int $0x80 popl %ebx test %eax,%eax jl syscall_error jz thread_start ret syscall_error: negl %eax pushl %eax #ifdef __PIC__ call __errno_location@PLT #else call __errno_location #endif popl 0(%eax) movl $-1, %eax ret thread_start: subl %ebp,%ebp /* terminate the stack frame */ call *%ebx pushl %eax #ifdef __PIC__ call _exit@PLT #else call _exit #endif /************************************************************************/ #elif defined(sparc) /************************************************************************/ /* Copyright (C) 1996, 1997 Free Software Foundation, Inc. Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx) Based on code written for the Intel by Richard Henderson (rth@tamu.edu) The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* clone() is even more special than fork() as it mucks with stacks and invokes a function in the right context after its all over. */ #include <asm/errno.h> #include <asm/unistd.h> /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ .text .align 4 .globl __clone .type __clone,@function .weak clone clone = __clone __clone: save %sp,-96,%sp /* sanity check arguments */ tst %i0 be __clone_syscall_error tst %i1 be __clone_syscall_error nop /* Do the system call */ mov %i1,%o1 mov %i2,%o0 set __NR_clone,%g1 ta 0x10 bcs __clone_syscall_error tst %o1 bne __thread_start nop mov %o0,%i0 ret restore __clone_syscall_error: call __errno_location set EINVAL,%i0 st %i0,[%o0] mov -1,%i0 ret restore __thread_start: call %i0 mov %i3,%o0 call _exit,0 nop /************************************************************************/ #else #error "Unknown Linux architecture" #endif #endif /* Linux && ! SDL_USE_PTHREADS */