libcoro/coro.c

/*
 * Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
 * 
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 * 
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 * 
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 *
 * This library is modelled strictly after Ralf S. Engelschalls article at
 * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must
 * go to Ralf S. Engelschall <rse@engelschall.com>.
 */

#include "coro.h"

#if !defined(STACK_ADJUST_PTR)
/* IRIX is decidedly NON-unix */
# if __sgi
#  define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
#  define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
#  define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
#  define STACK_ADJUST_SIZE(sp,ss) (ss)
# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
#  define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
#  define STACK_ADJUST_SIZE(sp,ss) (ss)
# else
#  define STACK_ADJUST_PTR(sp,ss) (sp)
#  define STACK_ADJUST_SIZE(sp,ss) (ss)
# endif
#endif

#if CORO_UCONTEXT
# include <stddef.h>
#endif

#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM

#include <stdlib.h>

#if CORO_SJLJ
# include <stdio.h>
# include <signal.h>
# include <unistd.h>
#endif

static volatile coro_func coro_init_func;
static volatile void *coro_init_arg;
static volatile coro_context *new_coro, *create_coro;

/* what we really want to detect here is wether we use a new-enough version of GAS */
/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
#if __GNUC__ >= 3 && __ELF__ && __linux__
# define HAVE_CFI 1
#endif

static void
coro_init (void)
{
  volatile coro_func func = coro_init_func;
  volatile void *arg = coro_init_arg;

  coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro);

  func ((void *)arg);

  /* the new coro returned. bad. just abort() for now */
  abort ();
}

# if CORO_SJLJ

static volatile int trampoline_count;

/* trampoline signal handler */
static void
trampoline (int sig)
{
  if (setjmp (((coro_context *)new_coro)->env))
    {
#if HAVE_CFI
      asm (".cfi_startproc");
#endif
      coro_init (); /* start it */
#if HAVE_CFI
      asm (".cfi_endproc");
#endif
    }
  else
    trampoline_count++;
}

# endif

#endif

#if CORO_ASM
asm (
     ".text\n"
     ".globl coro_transfer\n"
     ".type coro_transfer, @function\n"
     "coro_transfer:\n"
#if __amd64
# define NUM_SAVED 5
     "\tpush %rbx\n"
     "\tpush %r12\n"
     "\tpush %r13\n"
     "\tpush %r14\n"
     "\tpush %r15\n"
     "\tmov  %rsp, (%rdi)\n"
     "\tmov  (%rsi), %rsp\n"
     "\tpop  %r15\n"
     "\tpop  %r14\n"
     "\tpop  %r13\n"
     "\tpop  %r12\n"
     "\tpop  %rbx\n"
#elif __i386
# define NUM_SAVED 4
     "\tpush %ebx\n"
     "\tpush %esi\n"
     "\tpush %edi\n"
     "\tpush %ebp\n"
     "\tmov  %esp, (%eax)\n"
     "\tmov  (%edx), %esp\n"
     "\tpop  %ebp\n"
     "\tpop  %edi\n"
     "\tpop  %esi\n"
     "\tpop  %ebx\n"
#else
# error unsupported architecture
#endif
     "\tret\n"
);
#endif

#if CORO_PTHREAD

struct coro_init_args {
  coro_func func;
  void *arg;
  coro_context *self, *main;
};

pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;

static void *
trampoline (void *args_)
{
  struct coro_init_args *args = (struct coro_init_args *)args_;
  coro_func func = args->func;
  void *arg = args->arg;

  pthread_mutex_lock (&coro_mutex);
  pthread_cond_destroy (&args->self->c);
  coro_transfer (args->self, args->main);
  func (arg);
  pthread_mutex_unlock (&coro_mutex);

  return 0;
}

asm("");

void coro_transfer(coro_context *prev, coro_context *next)
{
  pthread_cond_init (&prev->c, 0);
  pthread_cond_signal (&next->c);
  pthread_cond_wait (&prev->c, &coro_mutex);
  pthread_cond_destroy (&prev->c);
}

#endif

/* initialize a machine state */
void coro_create (coro_context *ctx,
                  coro_func coro, void *arg,
                  void *sptr, long ssize)
{
#if CORO_UCONTEXT

  getcontext (&(ctx->uc));

  ctx->uc.uc_link           =  0;
  ctx->uc.uc_stack.ss_sp    = STACK_ADJUST_PTR (sptr,ssize);
  ctx->uc.uc_stack.ss_size  = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
  ctx->uc.uc_stack.ss_flags = 0;

  makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);

#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM

# if CORO_SJLJ
  stack_t ostk, nstk;
  struct sigaction osa, nsa;
  sigset_t nsig, osig;
# endif
  coro_context nctx;

  coro_init_func = coro;
  coro_init_arg  = arg;

  new_coro    = ctx;
  create_coro = &nctx;

# if CORO_SJLJ
  /* we use SIGUSR2. first block it, then fiddle with it. */

  sigemptyset (&nsig);
  sigaddset (&nsig, SIGUSR2);
  sigprocmask (SIG_BLOCK, &nsig, &osig);

  nsa.sa_handler = trampoline;
  sigemptyset (&nsa.sa_mask);
  nsa.sa_flags = SA_ONSTACK;

  if (sigaction (SIGUSR2, &nsa, &osa))
    {
      perror ("sigaction");
      abort ();
    }

  /* set the new stack */
  nstk.ss_sp    = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
  nstk.ss_size  = STACK_ADJUST_SIZE (sptr,ssize);
  nstk.ss_flags = 0;

  if (sigaltstack (&nstk, &ostk) < 0)
    {
      perror ("sigaltstack");
      abort ();
    }

  trampoline_count = 0;
  kill (getpid (), SIGUSR2);
  sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);

  while (!trampoline_count)
    sigsuspend (&nsig);

  sigaltstack (0, &nstk);
  nstk.ss_flags = SS_DISABLE;
  if (sigaltstack (&nstk, 0) < 0)
    perror ("sigaltstack");

  sigaltstack (0, &nstk);
  if (~nstk.ss_flags & SS_DISABLE)
    abort ();

  if (~ostk.ss_flags & SS_DISABLE)
    sigaltstack (&ostk, 0);

  sigaction (SIGUSR2, &osa, 0);

  sigprocmask (SIG_SETMASK, &osig, 0);

# elif CORO_LOSER

  setjmp (ctx->env);
#if __CYGWIN__
  ctx->env[7] = (long)((char *)sptr + ssize);
  ctx->env[8] = (long)coro_init;
#elif defined(_M_IX86)
  ((_JUMP_BUFFER *)&ctx->env)->Eip   = (long)coro_init;
  ((_JUMP_BUFFER *)&ctx->env)->Esp   = (long)STACK_ADJUST_PTR (sptr, ssize);
#elif defined(_M_AMD64)
  ((_JUMP_BUFFER *)&ctx->env)->Rip   = (__int64)coro_init;
  ((_JUMP_BUFFER *)&ctx->env)->Rsp   = (__int64)STACK_ADJUST_PTR (sptr, ssize);
#elif defined(_M_IA64)
  ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
  ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
#else
# error "microsoft libc or architecture not supported"
#endif

# elif CORO_LINUX

  _setjmp (ctx->env);
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
  ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
  ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
  ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
  ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
#elif defined (__GNU_LIBRARY__) && defined (__i386__)
  ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
  ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
  ctx->env[0].__jmpbuf[JB_PC]  = (long)coro_init;
  ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
#else
# error "linux libc or architecture not supported"
#endif

# elif CORO_IRIX

  setjmp (ctx->env);
  ctx->env[JB_PC] = (__uint64_t)coro_init;
  ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);

# elif CORO_ASM

  ctx->sp = (volatile void **)(ssize + (char *)sptr);
  /* we try to allow for both functions with and without frame pointers */
  *--ctx->sp = (void *)coro_init;
  {
    int i;
    for (i = NUM_SAVED; i--; )
      *--ctx->sp = 0;
  }

# endif

  coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);

# elif CORO_PTHREAD

  pthread_t id;
  pthread_attr_t attr;
  coro_context nctx;
  struct coro_init_args args;
  static int once;

  if (!once)
    {
      pthread_mutex_lock (&coro_mutex);
      once = 1;
    }

  args.func = coro;
  args.arg  = arg;
  args.self = ctx;
  args.main = &nctx;

  pthread_attr_init (&attr);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
  pthread_attr_setstack (&attr, sptr, (size_t)ssize);
  pthread_create (&id, &attr, trampoline, &args);

  pthread_cond_init (&args.self->c, 0);
  coro_transfer (args.main, args.self);

#else
# error unsupported backend
#endif
}

Revision:	1.35
Committed:	Mon Nov 3 16:05:38 2008 UTC (15 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-4_803
Changes since 1.34:	+32 -32 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/*
2	root	1.28	* Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
3	root	1.1	*
4			* Redistribution and use in source and binary forms, with or without modifica-
5			* tion, are permitted provided that the following conditions are met:
6			*
7			* 1. Redistributions of source code must retain the above copyright notice,
8			* this list of conditions and the following disclaimer.
9			*
10			* 2. Redistributions in binary form must reproduce the above copyright
11			* notice, this list of conditions and the following disclaimer in the
12			* documentation and/or other materials provided with the distribution.
13			*
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-
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-
18			* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
22			* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23			* OF THE POSSIBILITY OF SUCH DAMAGE.
24			*
25	root	1.29	* Alternatively, the contents of this file may be used under the terms of
26			* the GNU General Public License ("GPL") version 2 or any later version,
27			* in which case the provisions of the GPL are applicable instead of
28			* the above. If you wish to allow the use of your version of this file
29			* only under the terms of the GPL and not to allow others to use your
30			* version of this file under the BSD license, indicate your decision
31			* by deleting the provisions above and replace them with the notice
32			* and other provisions required by the GPL. If you do not delete the
33			* provisions above, a recipient may use your version of this file under
34			* either the BSD or the GPL.
35			*
36	root	1.1	* This library is modelled strictly after Ralf S. Engelschalls article at
37	root	1.29	* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must
38	root	1.1	* go to Ralf S. Engelschall <rse@engelschall.com>.
39			*/
40
41			#include "coro.h"
42
43	root	1.8	#if !defined(STACK_ADJUST_PTR)
44	root	1.5	/* IRIX is decidedly NON-unix */
45	root	1.8	# if __sgi
46			# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
47			# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
48	root	1.31	# elif (__i386__ && CORO_LINUX) \|\| (_M_IX86 && CORO_LOSER)
49	root	1.8	# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
50			# define STACK_ADJUST_SIZE(sp,ss) (ss)
51	root	1.31	# elif (__amd64__ && CORO_LINUX) \|\| ((_M_AMD64 \|\| _M_IA64) && CORO_LOSER)
52	root	1.18	# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
53			# define STACK_ADJUST_SIZE(sp,ss) (ss)
54	root	1.8	# else
55			# define STACK_ADJUST_PTR(sp,ss) (sp)
56			# define STACK_ADJUST_SIZE(sp,ss) (ss)
57			# endif
58	root	1.5	#endif
59	root	1.7
60	root	1.20	#if CORO_UCONTEXT
61			# include <stddef.h>
62			#endif
63
64	root	1.27	#if CORO_SJLJ \|\| CORO_LOSER \|\| CORO_LINUX \|\| CORO_IRIX \|\| CORO_ASM
65	root	1.1
66	root	1.17	#include <stdlib.h>
67
68	root	1.14	#if CORO_SJLJ
69	root	1.15	# include <stdio.h>
70	root	1.14	# include <signal.h>
71	root	1.17	# include <unistd.h>
72	root	1.14	#endif
73	root	1.1
74			static volatile coro_func coro_init_func;
75			static volatile void *coro_init_arg;
76			static volatile coro_context new_coro, create_coro;
77
78	root	1.25	/* what we really want to detect here is wether we use a new-enough version of GAS */
79	root	1.28	/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
80			#if __GNUC__ >= 3 && __ELF__ && __linux__
81	root	1.25	# define HAVE_CFI 1
82			#endif
83
84	root	1.1	static void
85			coro_init (void)
86			{
87			volatile coro_func func = coro_init_func;
88			volatile void *arg = coro_init_arg;
89
90	root	1.2	coro_transfer ((coro_context )new_coro, (coro_context )create_coro);
91	root	1.1
92	root	1.3	func ((void *)arg);
93	root	1.1
94			/* the new coro returned. bad. just abort() for now */
95			abort ();
96			}
97
98			# if CORO_SJLJ
99
100			static volatile int trampoline_count;
101
102			/* trampoline signal handler */
103			static void
104	root	1.14	trampoline (int sig)
105	root	1.1	{
106	root	1.3	if (setjmp (((coro_context *)new_coro)->env))
107	root	1.26	{
108			#if HAVE_CFI
109			asm (".cfi_startproc");
110			#endif
111			coro_init (); /* start it */
112			#if HAVE_CFI
113			asm (".cfi_endproc");
114			#endif
115			}
116	root	1.1	else
117			trampoline_count++;
118			}
119
120			# endif
121
122			#endif
123
124	root	1.27	#if CORO_ASM
125	root	1.35	asm (
126			".text\n"
127			".globl coro_transfer\n"
128			".type coro_transfer, @function\n"
129			"coro_transfer:\n"
130	root	1.27	#if __amd64
131	root	1.32	# define NUM_SAVED 5
132	root	1.35	"\tpush %rbx\n"
133			"\tpush %r12\n"
134			"\tpush %r13\n"
135			"\tpush %r14\n"
136			"\tpush %r15\n"
137			"\tmov %rsp, (%rdi)\n"
138			"\tmov (%rsi), %rsp\n"
139			"\tpop %r15\n"
140			"\tpop %r14\n"
141			"\tpop %r13\n"
142			"\tpop %r12\n"
143			"\tpop %rbx\n"
144	root	1.27	#elif __i386
145	root	1.32	# define NUM_SAVED 4
146	root	1.35	"\tpush %ebx\n"
147			"\tpush %esi\n"
148			"\tpush %edi\n"
149			"\tpush %ebp\n"
150			"\tmov %esp, (%eax)\n"
151			"\tmov (%edx), %esp\n"
152			"\tpop %ebp\n"
153			"\tpop %edi\n"
154			"\tpop %esi\n"
155			"\tpop %ebx\n"
156	root	1.27	#else
157			# error unsupported architecture
158			#endif
159	root	1.35	"\tret\n"
160			);
161	root	1.27	#endif
162
163	root	1.30	#if CORO_PTHREAD
164
165			struct coro_init_args {
166			coro_func func;
167			void *arg;
168			coro_context self, main;
169			};
170
171			pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
172
173			static void *
174			trampoline (void *args_)
175			{
176			struct coro_init_args args = (struct coro_init_args )args_;
177			coro_func func = args->func;
178			void *arg = args->arg;
179
180			pthread_mutex_lock (&coro_mutex);
181			pthread_cond_destroy (&args->self->c);
182			coro_transfer (args->self, args->main);
183			func (arg);
184			pthread_mutex_unlock (&coro_mutex);
185
186			return 0;
187			}
188
189	root	1.35	asm("");
190
191	root	1.30	void coro_transfer(coro_context prev, coro_context next)
192			{
193			pthread_cond_init (&prev->c, 0);
194			pthread_cond_signal (&next->c);
195			pthread_cond_wait (&prev->c, &coro_mutex);
196			pthread_cond_destroy (&prev->c);
197			}
198
199			#endif
200
201	root	1.1	/* initialize a machine state */
202	root	1.23	void coro_create (coro_context *ctx,
203			coro_func coro, void *arg,
204			void *sptr, long ssize)
205	root	1.1	{
206			#if CORO_UCONTEXT
207
208			getcontext (&(ctx->uc));
209
210	root	1.5	ctx->uc.uc_link = 0;
211	root	1.9	ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
212	root	1.8	ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
213	root	1.1	ctx->uc.uc_stack.ss_flags = 0;
214
215			makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
216
217	root	1.27	#elif CORO_SJLJ \|\| CORO_LOSER \|\| CORO_LINUX \|\| CORO_IRIX \|\| CORO_ASM
218	root	1.1
219			# if CORO_SJLJ
220			stack_t ostk, nstk;
221			struct sigaction osa, nsa;
222			sigset_t nsig, osig;
223			# endif
224			coro_context nctx;
225
226			coro_init_func = coro;
227			coro_init_arg = arg;
228
229			new_coro = ctx;
230			create_coro = &nctx;
231
232			# if CORO_SJLJ
233			/* we use SIGUSR2. first block it, then fiddle with it. */
234
235			sigemptyset (&nsig);
236			sigaddset (&nsig, SIGUSR2);
237			sigprocmask (SIG_BLOCK, &nsig, &osig);
238
239			nsa.sa_handler = trampoline;
240			sigemptyset (&nsa.sa_mask);
241			nsa.sa_flags = SA_ONSTACK;
242
243			if (sigaction (SIGUSR2, &nsa, &osa))
244	root	1.23	{
245			perror ("sigaction");
246			abort ();
247			}
248	root	1.1
249			/* set the new stack */
250	root	1.9	nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
251	root	1.8	nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
252	root	1.1	nstk.ss_flags = 0;
253
254			if (sigaltstack (&nstk, &ostk) < 0)
255	root	1.23	{
256			perror ("sigaltstack");
257			abort ();
258			}
259	root	1.1
260			trampoline_count = 0;
261			kill (getpid (), SIGUSR2);
262			sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
263
264			while (!trampoline_count)
265			sigsuspend (&nsig);
266
267			sigaltstack (0, &nstk);
268			nstk.ss_flags = SS_DISABLE;
269			if (sigaltstack (&nstk, 0) < 0)
270			perror ("sigaltstack");
271
272			sigaltstack (0, &nstk);
273			if (~nstk.ss_flags & SS_DISABLE)
274			abort ();
275
276			if (~ostk.ss_flags & SS_DISABLE)
277			sigaltstack (&ostk, 0);
278
279	root	1.19	sigaction (SIGUSR2, &osa, 0);
280	root	1.1
281			sigprocmask (SIG_SETMASK, &osig, 0);
282
283	root	1.16	# elif CORO_LOSER
284	root	1.1
285	root	1.4	setjmp (ctx->env);
286	root	1.21	#if __CYGWIN__
287	pcg	1.11	ctx->env[7] = (long)((char *)sptr + ssize);
288			ctx->env[8] = (long)coro_init;
289	root	1.21	#elif defined(_M_IX86)
290			((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
291	root	1.31	((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
292	root	1.21	#elif defined(_M_AMD64)
293			((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
294	root	1.31	((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
295	root	1.21	#elif defined(_M_IA64)
296			((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
297	root	1.31	((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
298	root	1.21	#else
299	root	1.30	# error "microsoft libc or architecture not supported"
300	root	1.21	#endif
301	root	1.4
302			# elif CORO_LINUX
303
304	root	1.22	_setjmp (ctx->env);
305	root	1.24	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
306	root	1.10	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
307	root	1.24	ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
308			#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
309	root	1.4	ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
310			ctx->env[0].__jmpbuf[0].__sp = (int )((char )sptr + ssize);
311	root	1.24	#elif defined (__GNU_LIBRARY__) && defined (__i386__)
312	root	1.4	ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
313			ctx->env[0].__jmpbuf[0].__sp = (void )((char )sptr + ssize);
314	root	1.24	#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
315	root	1.12	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
316	root	1.24	ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
317	root	1.4	#else
318	root	1.27	# error "linux libc or architecture not supported"
319	root	1.4	#endif
320	root	1.5
321			# elif CORO_IRIX
322
323			setjmp (ctx->env);
324	root	1.6	ctx->env[JB_PC] = (__uint64_t)coro_init;
325	root	1.24	ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
326	root	1.1
327	root	1.27	# elif CORO_ASM
328
329			ctx->sp = (volatile void *)(ssize + (char )sptr);
330	root	1.33	/* we try to allow for both functions with and without frame pointers */
331	root	1.27	--ctx->sp = (void )coro_init;
332	root	1.33	{
333			int i;
334			for (i = NUM_SAVED; i--; )
335	root	1.35	*--ctx->sp = 0;
336	root	1.33	}
337	root	1.27
338	root	1.1	# endif
339
340	root	1.2	coro_transfer ((coro_context )create_coro, (coro_context )new_coro);
341	root	1.1
342	root	1.30	# elif CORO_PTHREAD
343
344			pthread_t id;
345			pthread_attr_t attr;
346			coro_context nctx;
347			struct coro_init_args args;
348			static int once;
349
350			if (!once)
351			{
352			pthread_mutex_lock (&coro_mutex);
353			once = 1;
354			}
355
356			args.func = coro;
357			args.arg = arg;
358			args.self = ctx;
359			args.main = &nctx;
360
361			pthread_attr_init (&attr);
362			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
363			pthread_attr_setstack (&attr, sptr, (size_t)ssize);
364			pthread_create (&id, &attr, trampoline, &args);
365
366			pthread_cond_init (&args.self->c, 0);
367			coro_transfer (args.main, args.self);
368
369	root	1.1	#else
370	root	1.30	# error unsupported backend
371	root	1.1	#endif
372			}
373