[ViewVC] Diff of: cvs/libcoro/coro.c

Comparing libcoro/coro.c (file contents):
Revision 1.42 by root, Mon Nov 10 04:37:23 2008 UTC vs.
Revision 1.67 by root, Fri Dec 21 04:48:17 2012 UTC

…		…
1	/*	1	/*
2	* Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de>	2	* Copyright (c) 2001-2011 Marc Alexander Lehmann <schmorp@schmorp.de>
3	*	3	*
4	* Redistribution and use in source and binary forms, with or without modifica-	4	* Redistribution and use in source and binary forms, with or without modifica-
5	* tion, are permitted provided that the following conditions are met:	5	* tion, are permitted provided that the following conditions are met:
6	*	6	*
7	* 1. Redistributions of source code must retain the above copyright notice,	7	* 1. Redistributions of source code must retain the above copyright notice,
8	* this list of conditions and the following disclaimer.	8	* this list of conditions and the following disclaimer.
9	*	9	*
10	* 2. Redistributions in binary form must reproduce the above copyright	10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the	11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.	12	* documentation and/or other materials provided with the distribution.
13	*	13	*
14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
15	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-	15	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
16	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO	16	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
17	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-	17	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
18	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,	18	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
38	* go to Ralf S. Engelschall <rse@engelschall.com>.	38	* go to Ralf S. Engelschall <rse@engelschall.com>.
39	*/	39	*/
40		40
41	#include "coro.h"	41	#include "coro.h"
42		42
		43	#include <stddef.h>
43	#include <string.h>	44	#include <string.h>
44		45
45	/*****************************************************************************/	46	/*****************************************************************************/
46	/* ucontext/setjmp/asm backends */	47	/* ucontext/setjmp/asm backends */
47	/*****************************************************************************/	48	/*****************************************************************************/
…		…
86	volatile coro_func func = coro_init_func;	87	volatile coro_func func = coro_init_func;
87	volatile void *arg = coro_init_arg;	88	volatile void *arg = coro_init_arg;
88		89
89	coro_transfer (new_coro, create_coro);	90	coro_transfer (new_coro, create_coro);
90		91
		92	#if __GCC_HAVE_DWARF2_CFI_ASM && __amd64
		93	asm (".cfi_undefined rip");
		94	#endif
		95
91	func ((void *)arg);	96	func ((void *)arg);
92		97
93	/* the new coro returned. bad. just abort() for now */	98	/* the new coro returned. bad. just abort() for now */
94	abort ();	99	abort ();
95	}	100	}
…		…
100		105
101	/* trampoline signal handler */	106	/* trampoline signal handler */
102	static void	107	static void
103	trampoline (int sig)	108	trampoline (int sig)
104	{	109	{
105	if (
106	#if _XOPEN_UNIX > 0
107	_setjmp (new_coro->env)	110	if (coro_setjmp (new_coro->env))
108	#else
109	sigsetjmp (new_coro->env, 0)
110	#endif
111	) {
112	coro_init (); /* start it */	111	coro_init (); /* start it */
113	}
114	else	112	else
115	trampoline_done = 1;	113	trampoline_done = 1;
116	}	114	}
117		115
118	# endif	116	# endif
119		117
120	# if CORO_ASM	118	# if CORO_ASM
121		119
		120	#if _WIN32 \|\| __CYGWIN__
		121	#define CORO_WIN_TIB 1
		122	#endif
		123
122	asm (	124	asm (
123	".text\n"	125	"\t.text\n"
		126	#if _WIN32 \|\| __CYGWIN__
		127	"\t.globl _coro_transfer\n"
		128	"_coro_transfer:\n"
		129	#else
124	".globl coro_transfer\n"	130	"\t.globl coro_transfer\n"
125	".type coro_transfer, @function\n"
126	"coro_transfer:\n"	131	"coro_transfer:\n"
		132	#endif
		133	/* windows, of course, gives a shit on the amd64 ABI and uses different registers */
		134	/* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */
127	#if __amd64	135	#if __amd64
		136
		137	#if _WIN32 \|\| __CYGWIN__
		138	#define NUM_SAVED 29
		139	"\tsubq $168, %rsp\t" /* one dummy qword to improve alignment */
		140	"\tmovaps %xmm6, (%rsp)\n"
		141	"\tmovaps %xmm7, 16(%rsp)\n"
		142	"\tmovaps %xmm8, 32(%rsp)\n"
		143	"\tmovaps %xmm9, 48(%rsp)\n"
		144	"\tmovaps %xmm10, 64(%rsp)\n"
		145	"\tmovaps %xmm11, 80(%rsp)\n"
		146	"\tmovaps %xmm12, 96(%rsp)\n"
		147	"\tmovaps %xmm13, 112(%rsp)\n"
		148	"\tmovaps %xmm14, 128(%rsp)\n"
		149	"\tmovaps %xmm15, 144(%rsp)\n"
		150	"\tpushq %rsi\n"
		151	"\tpushq %rdi\n"
		152	"\tpushq %rbp\n"
		153	"\tpushq %rbx\n"
		154	"\tpushq %r12\n"
		155	"\tpushq %r13\n"
		156	"\tpushq %r14\n"
		157	"\tpushq %r15\n"
		158	#if CORO_WIN_TIB
		159	"\tpushq %fs:0x0\n"
		160	"\tpushq %fs:0x8\n"
		161	"\tpushq %fs:0xc\n"
		162	#endif
		163	"\tmovq %rsp, (%rcx)\n"
		164	"\tmovq (%rdx), %rsp\n"
		165	#if CORO_WIN_TIB
		166	"\tpopq %fs:0xc\n"
		167	"\tpopq %fs:0x8\n"
		168	"\tpopq %fs:0x0\n"
		169	#endif
		170	"\tpopq %r15\n"
		171	"\tpopq %r14\n"
		172	"\tpopq %r13\n"
		173	"\tpopq %r12\n"
		174	"\tpopq %rbx\n"
		175	"\tpopq %rbp\n"
		176	"\tpopq %rdi\n"
		177	"\tpopq %rsi\n"
		178	"\tmovaps (%rsp), %xmm6\n"
		179	"\tmovaps 16(%rsp), %xmm7\n"
		180	"\tmovaps 32(%rsp), %xmm8\n"
		181	"\tmovaps 48(%rsp), %xmm9\n"
		182	"\tmovaps 64(%rsp), %xmm10\n"
		183	"\tmovaps 80(%rsp), %xmm11\n"
		184	"\tmovaps 96(%rsp), %xmm12\n"
		185	"\tmovaps 112(%rsp), %xmm13\n"
		186	"\tmovaps 128(%rsp), %xmm14\n"
		187	"\tmovaps 144(%rsp), %xmm15\n"
		188	"\taddq $168, %rsp\n"
		189	#else
128	#define NUM_SAVED 6	190	#define NUM_SAVED 6
129	"\tpush %rbp\n"	191	"\tpushq %rbp\n"
130	"\tpush %rbx\n"	192	"\tpushq %rbx\n"
131	"\tpush %r12\n"	193	"\tpushq %r12\n"
132	"\tpush %r13\n"	194	"\tpushq %r13\n"
133	"\tpush %r14\n"	195	"\tpushq %r14\n"
134	"\tpush %r15\n"	196	"\tpushq %r15\n"
135	"\tmov %rsp, (%rdi)\n"	197	"\tmovq %rsp, (%rdi)\n"
136	"\tmov (%rsi), %rsp\n"	198	"\tmovq (%rsi), %rsp\n"
137	"\tpop %r15\n"	199	"\tpopq %r15\n"
138	"\tpop %r14\n"	200	"\tpopq %r14\n"
139	"\tpop %r13\n"	201	"\tpopq %r13\n"
140	"\tpop %r12\n"	202	"\tpopq %r12\n"
141	"\tpop %rbx\n"	203	"\tpopq %rbx\n"
142	"\tpop %rbp\n"	204	"\tpopq %rbp\n"
		205	#endif
		206	"\tpopq %rcx\n"
		207	"\tjmpq *%rcx\n"
		208
143	#elif __i386	209	#elif __i386
		210
144	#define NUM_SAVED 4	211	#define NUM_SAVED 4
145	"\tpush %ebp\n"	212	"\tpushl %ebp\n"
146	"\tpush %ebx\n"	213	"\tpushl %ebx\n"
147	"\tpush %esi\n"	214	"\tpushl %esi\n"
148	"\tpush %edi\n"	215	"\tpushl %edi\n"
		216	#if CORO_WIN_TIB
		217	#undef NUM_SAVED
		218	#define NUM_SAVED 7
		219	"\tpushl %fs:0\n"
		220	"\tpushl %fs:4\n"
		221	"\tpushl %fs:8\n"
		222	#endif
149	"\tmov %esp, (%eax)\n"	223	"\tmovl %esp, (%eax)\n"
150	"\tmov (%edx), %esp\n"	224	"\tmovl (%edx), %esp\n"
		225	#if CORO_WIN_TIB
		226	"\tpopl %fs:8\n"
		227	"\tpopl %fs:4\n"
		228	"\tpopl %fs:0\n"
		229	#endif
151	"\tpop %edi\n"	230	"\tpopl %edi\n"
152	"\tpop %esi\n"	231	"\tpopl %esi\n"
153	"\tpop %ebx\n"	232	"\tpopl %ebx\n"
154	"\tpop %ebp\n"	233	"\tpopl %ebp\n"
		234	"\tpopl %ecx\n"
		235	"\tjmpl *%ecx\n"
		236
155	#else	237	#else
156	#error unsupported architecture	238	#error unsupported architecture
157	#endif	239	#endif
158	"\tret\n"
159	);	240	);
160		241
161	# endif	242	# endif
162		243
163	void	244	void
164	coro_create (coro_context ctx, coro_func coro, void arg, void *sptr, long ssize)	245	coro_create (coro_context ctx, coro_func coro, void arg, void *sptr, size_t ssize)
165	{	246	{
166	coro_context nctx;	247	coro_context nctx;
167	# if CORO_SJLJ	248	# if CORO_SJLJ
168	stack_t ostk, nstk;	249	stack_t ostk, nstk;
169	struct sigaction osa, nsa;	250	struct sigaction osa, nsa;
…		…
195	perror ("sigaction");	276	perror ("sigaction");
196	abort ();	277	abort ();
197	}	278	}
198		279
199	/* set the new stack */	280	/* set the new stack */
200	nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */	281	nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */
201	nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);	282	nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize);
202	nstk.ss_flags = 0;	283	nstk.ss_flags = 0;
203		284
204	if (sigaltstack (&nstk, &ostk) < 0)	285	if (sigaltstack (&nstk, &ostk) < 0)
205	{	286	{
206	perror ("sigaltstack");	287	perror ("sigaltstack");
…		…
229	sigaction (SIGUSR2, &osa, 0);	310	sigaction (SIGUSR2, &osa, 0);
230	sigprocmask (SIG_SETMASK, &osig, 0);	311	sigprocmask (SIG_SETMASK, &osig, 0);
231		312
232	# elif CORO_LOSER	313	# elif CORO_LOSER
233		314
234	setjmp (ctx->env);	315	coro_setjmp (ctx->env);
235	#if __CYGWIN__	316	#if __CYGWIN__ && __i386
		317	ctx->env[8] = (long) coro_init;
236	ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);	318	ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
237	ctx->env[8] = (long)coro_init;	319	#elif __CYGWIN__ && __x86_64
		320	ctx->env[7] = (long) coro_init;
		321	ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
		322	#elif defined __MINGW32__
		323	ctx->env[5] = (long) coro_init;
		324	ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
238	#elif defined(_M_IX86)	325	#elif defined _M_IX86
239	((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;	326	((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init;
240	((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);	327	((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
241	#elif defined(_M_AMD64)	328	#elif defined _M_AMD64
242	((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;	329	((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init;
243	((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);	330	((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
244	#elif defined(_M_IA64)	331	#elif defined _M_IA64
245	((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;	332	((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init;
246	((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);	333	((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
247	#else	334	#else
248	#error "microsoft libc or architecture not supported"	335	#error "microsoft libc or architecture not supported"
249	#endif	336	#endif
250		337
251	# elif CORO_LINUX	338	# elif CORO_LINUX
252		339
253	_setjmp (ctx->env);	340	coro_setjmp (ctx->env);
254	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)	341	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
255	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;	342	ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
256	ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);	343	ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
257	#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)	344	#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
258	ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;	345	ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
259	ctx->env[0].__jmpbuf[0].__sp = (int )((char )sptr + ssize) - sizeof (long);	346	ctx->env[0].__jmpbuf[0].__sp = (int ) ((char )sptr + ssize) - sizeof (long);
260	#elif defined (__GNU_LIBRARY__) && defined (__i386__)	347	#elif defined (__GNU_LIBRARY__) && defined (__i386__)
261	ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;	348	ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
262	ctx->env[0].__jmpbuf[0].__sp = (void )((char )sptr + ssize) - sizeof (long);	349	ctx->env[0].__jmpbuf[0].__sp = (void ) ((char )sptr + ssize) - sizeof (long);
263	#elif defined (__GNU_LIBRARY__) && defined (__amd64__)	350	#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
264	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;	351	ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
265	ctx->env[0].__jmpbuf[0].__sp = (void )((char )sptr + ssize) - sizeof (long);	352	ctx->env[0].__jmpbuf[0].__sp = (void ) ((char )sptr + ssize) - sizeof (long);
266	#else	353	#else
267	#error "linux libc or architecture not supported"	354	#error "linux libc or architecture not supported"
268	#endif	355	#endif
269		356
270	# elif CORO_IRIX	357	# elif CORO_IRIX
271		358
272	sigsetjmp (ctx->env, 0);	359	coro_setjmp (ctx->env, 0);
273	ctx->env[JB_PC] = (__uint64_t)coro_init;	360	ctx->env[JB_PC] = (__uint64_t)coro_init;
274	ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);	361	ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
275		362
276	# elif CORO_ASM	363	# elif CORO_ASM
277		364
278	ctx->sp = (void *)(ssize + (char )sptr);	365	ctx->sp = (void *)(ssize + (char )sptr);
279	--ctx->sp = (void )abort; /* needed for alignment only */	366	--ctx->sp = (void )abort; /* needed for alignment only */
280	--ctx->sp = (void )coro_init;	367	--ctx->sp = (void )coro_init;
		368
		369	#if CORO_WIN_TIB
		370	--ctx->sp = 0; / ExceptionList */
		371	--ctx->sp = (char )sptr + ssize; /* StackBase */
		372	--ctx->sp = sptr; / StackLimit */
		373	#endif
		374
281	ctx->sp -= NUM_SAVED;	375	ctx->sp -= NUM_SAVED;
		376	memset (ctx->sp, 0, sizeof (ctx->sp) NUM_SAVED);
282		377
283	# elif CORO_UCONTEXT	378	# elif CORO_UCONTEXT
284		379
285	getcontext (&(ctx->uc));	380	getcontext (&(ctx->uc));
286		381
…		…
341	void	436	void
342	coro_transfer (coro_context prev, coro_context next)	437	coro_transfer (coro_context prev, coro_context next)
343	{	438	{
344	pthread_cond_signal (&next->cv);	439	pthread_cond_signal (&next->cv);
345	pthread_cond_wait (&prev->cv, &coro_mutex);	440	pthread_cond_wait (&prev->cv, &coro_mutex);
		441	#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
		442	pthread_testcancel ();
		443	#endif
346	}	444	}
347		445
348	void	446	void
349	coro_create (coro_context ctx, coro_func coro, void arg, void *sptr, long ssize)	447	coro_create (coro_context ctx, coro_func coro, void arg, void *sptr, size_t ssize)
350	{	448	{
351	static coro_context nctx;	449	static coro_context nctx;
352	static int once;	450	static int once;
353		451
354	if (!once)	452	if (!once)
…		…
371	args.arg = arg;	469	args.arg = arg;
372	args.self = ctx;	470	args.self = ctx;
373	args.main = &nctx;	471	args.main = &nctx;
374		472
375	pthread_attr_init (&attr);	473	pthread_attr_init (&attr);
		474	#if __UCLIBC__
		475	/* exists, but is borked */
		476	/pthread_attr_setstacksize (&attr, (size_t)ssize);/
		477	#elif __CYGWIN__
		478	/* POSIX, not here */
		479	pthread_attr_setstacksize (&attr, (size_t)ssize);
		480	#else
376	pthread_attr_setstack (&attr, sptr, (size_t)ssize);	481	pthread_attr_setstack (&attr, sptr, (size_t)ssize);
		482	#endif
377	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);	483	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
378	pthread_create (&ctx->id, &attr, coro_init, &args);	484	pthread_create (&ctx->id, &attr, coro_init, &args);
379		485
380	coro_transfer (args.main, args.self);	486	coro_transfer (args.main, args.self);
381	}	487	}
…		…
395	}	501	}
396		502
397	pthread_cond_destroy (&ctx->cv);	503	pthread_cond_destroy (&ctx->cv);
398	}	504	}
399		505
		506	/*****************************************************************************/
		507	/* fiber backend */
		508	/*****************************************************************************/
		509	#elif CORO_FIBER
		510
		511	#define WIN32_LEAN_AND_MEAN
		512	#if _WIN32_WINNT < 0x0400
		513	#undef _WIN32_WINNT
		514	#define _WIN32_WINNT 0x0400
		515	#endif
		516	#include <windows.h>
		517
		518	VOID CALLBACK
		519	coro_init (PVOID arg)
		520	{
		521	coro_context ctx = (coro_context )arg;
		522
		523	ctx->coro (ctx->arg);
		524	}
		525
		526	void
		527	coro_transfer (coro_context prev, coro_context next)
		528	{
		529	if (!prev->fiber)
		530	{
		531	prev->fiber = GetCurrentFiber ();
		532
		533	if (prev->fiber == 0 \|\| prev->fiber == (void *)0x1e00)
		534	prev->fiber = ConvertThreadToFiber (0);
		535	}
		536
		537	SwitchToFiber (next->fiber);
		538	}
		539
		540	void
		541	coro_create (coro_context ctx, coro_func coro, void arg, void *sptr, size_t ssize)
		542	{
		543	ctx->fiber = 0;
		544	ctx->coro = coro;
		545	ctx->arg = arg;
		546
		547	if (!coro)
		548	return;
		549
		550	ctx->fiber = CreateFiber (ssize, coro_init, ctx);
		551	}
		552
		553	void
		554	coro_destroy (coro_context *ctx)
		555	{
		556	DeleteFiber (ctx->fiber);
		557	}
		558
400	#else	559	#else
401	# error unsupported backend	560	#error unsupported backend
		561	#endif
		562
		563	/*****************************************************************************/
		564	/* stack management */
		565	/*****************************************************************************/
		566	#if CORO_STACKALLOC
		567
		568	#include <stdlib.h>
		569
		570	#ifndef _WIN32
		571	# include <unistd.h>
		572	#endif
		573
		574	#if CORO_USE_VALGRIND
		575	# include <valgrind/valgrind.h>
		576	#endif
		577
		578	#if _POSIX_MAPPED_FILES
		579	# include <sys/mman.h>
		580	# define CORO_MMAP 1
		581	# ifndef MAP_ANONYMOUS
		582	# ifdef MAP_ANON
		583	# define MAP_ANONYMOUS MAP_ANON
		584	# else
		585	# undef CORO_MMAP
		586	# endif
402	#endif	587	# endif
		588	# include <limits.h>
		589	#else
		590	# undef CORO_MMAP
		591	#endif
403		592
		593	#if _POSIX_MEMORY_PROTECTION
		594	# ifndef CORO_GUARDPAGES
		595	# define CORO_GUARDPAGES 4
		596	# endif
		597	#else
		598	# undef CORO_GUARDPAGES
		599	#endif
		600
		601	#if !CORO_MMAP
		602	# undef CORO_GUARDPAGES
		603	#endif
		604
		605	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		606	# undef CORO_GUARDPAGES
		607	#endif
		608
		609	#ifndef CORO_GUARDPAGES
		610	# define CORO_GUARDPAGES 0
		611	#endif
		612
		613	#if !PAGESIZE
		614	#if !CORO_MMAP
		615	#define PAGESIZE 4096
		616	#else
		617	static size_t
		618	coro_pagesize (void)
		619	{
		620	static size_t pagesize;
		621
		622	if (!pagesize)
		623	pagesize = sysconf (_SC_PAGESIZE);
		624
		625	return pagesize;
		626	}
		627
		628	#define PAGESIZE coro_pagesize ()
		629	#endif
		630	#endif
		631
		632	int
		633	coro_stack_alloc (struct coro_stack *stack, unsigned int size)
		634	{
		635	if (!size)
		636	size = 256 * 1024;
		637
		638	stack->sptr = 0;
		639	stack->ssze = ((size_t)size * sizeof (void ) + PAGESIZE - 1) / PAGESIZE PAGESIZE;
		640
		641	#if CORO_FIBER
		642
		643	stack->sptr = (void *)stack;
		644	return 1;
		645
		646	#else
		647
		648	size_t ssze = stack->ssze + CORO_GUARDPAGES * PAGESIZE;
		649	void *base;
		650
		651	#if CORO_MMAP
		652	/* mmap supposedly does allocate-on-write for us */
		653	base = mmap (0, ssze, PROT_READ \| PROT_WRITE \| PROT_EXEC, MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
		654
		655	if (base == (void *)-1)
		656	{
		657	/* some systems don't let us have executable heap */
		658	/* we assume they won't need executable stack in that case */
		659	base = mmap (0, ssze, PROT_READ \| PROT_WRITE, MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
		660
		661	if (base == (void *)-1)
		662	return 0;
		663	}
		664
		665	#if CORO_GUARDPAGES
		666	mprotect (base, CORO_GUARDPAGES * PAGESIZE, PROT_NONE);
		667	#endif
		668
		669	base = (void)((char )base + CORO_GUARDPAGES * PAGESIZE);
		670	#else
		671	base = malloc (ssze);
		672	if (!base)
		673	return 0;
		674	#endif
		675
		676	#if CORO_USE_VALGRIND
		677	stack->valgrind_id = VALGRIND_STACK_REGISTER ((char )base, ((char )base) + ssze - CORO_GUARDPAGES * PAGESIZE);
		678	#endif
		679
		680	stack->sptr = base;
		681	return 1;
		682
		683	#endif
		684	}
		685
		686	void
		687	coro_stack_free (struct coro_stack *stack)
		688	{
		689	#if CORO_FIBER
		690	/* nop */
		691	#else
		692	#if CORO_USE_VALGRIND
		693	VALGRIND_STACK_DEREGISTER (stack->valgrind_id);
		694	#endif
		695
		696	#if CORO_MMAP
		697	if (stack->sptr)
		698	munmap ((void)((char )stack->sptr - CORO_GUARDPAGES * PAGESIZE),
		699	stack->ssze + CORO_GUARDPAGES * PAGESIZE);
		700	#else
		701	free (stack->sptr);
		702	#endif
		703	#endif
		704	}
		705
		706	#endif
		707

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Comparing libcoro/coro.c (file contents): Revision 1.42 by root, Mon Nov 10 04:37:23 2008 UTC vs. Revision 1.67 by root, Fri Dec 21 04:48:17 2012 UTC

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Comparing libcoro/coro.c (file contents):
Revision 1.42 by root, Mon Nov 10 04:37:23 2008 UTC vs.
Revision 1.67 by root, Fri Dec 21 04:48:17 2012 UTC