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
void __attribute__((__noinline__, __regparm__(2)))
coro_transfer (struct coro_context *prev, struct coro_context *next)
{
  asm volatile (
#if __amd64
# define NUM_SAVED 5
     "push %%rbx\n\t"
     "push %%r12\n\t"
     "push %%r13\n\t"
     "push %%r14\n\t"
     "push %%r15\n\t"
     "mov  %%rsp, %0\n\t"
     "mov  %1, %%rsp\n\t"
     "pop  %%r15\n\t"
     "pop  %%r14\n\t"
     "pop  %%r13\n\t"
     "pop  %%r12\n\t"
     "pop  %%rbx\n\t"
#elif __i386
# define NUM_SAVED 4
     "push %%ebx\n\t"
     "push %%esi\n\t"
     "push %%edi\n\t"
     "push %%ebp\n\t"
     "mov  %%esp, %0\n\t"
     "mov  %1, %%esp\n\t"
     "pop  %%ebp\n\t"
     "pop  %%edi\n\t"
     "pop  %%esi\n\t"
     "pop  %%ebx\n\t"
#else
# error unsupported architecture
#endif
     : "=m" (prev->sp)
     : "m" (next->sp)
  );
}
#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;
}

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);
  *--ctx->sp = (void *)coro_init;
  *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
  ctx->sp -= NUM_SAVED;

# 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:	1.32
Committed:	Wed Jul 16 00:47:05 2008 UTC (15 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-4_748, rel-4_8, rel-4_747, rel-4_801, rel-4_479, rel-4_745, rel-4_746
Changes since 1.31:	+4 -4 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	1.32	void __attribute__((__noinline__, __regparm__(2)))
126	root	1.27	coro_transfer (struct coro_context prev, struct coro_context next)
127			{
128			asm volatile (
129			#if __amd64
130	root	1.32	# define NUM_SAVED 5
131	root	1.27	"push %%rbx\n\t"
132			"push %%r12\n\t"
133			"push %%r13\n\t"
134			"push %%r14\n\t"
135			"push %%r15\n\t"
136			"mov %%rsp, %0\n\t"
137			"mov %1, %%rsp\n\t"
138			"pop %%r15\n\t"
139			"pop %%r14\n\t"
140			"pop %%r13\n\t"
141			"pop %%r12\n\t"
142			"pop %%rbx\n\t"
143			#elif __i386
144	root	1.32	# define NUM_SAVED 4
145	root	1.27	"push %%ebx\n\t"
146			"push %%esi\n\t"
147			"push %%edi\n\t"
148			"push %%ebp\n\t"
149			"mov %%esp, %0\n\t"
150			"mov %1, %%esp\n\t"
151			"pop %%ebp\n\t"
152			"pop %%edi\n\t"
153			"pop %%esi\n\t"
154			"pop %%ebx\n\t"
155			#else
156			# error unsupported architecture
157			#endif
158			: "=m" (prev->sp)
159			: "m" (next->sp)
160			);
161			}
162			#endif
163
164	root	1.30	#if CORO_PTHREAD
165
166			struct coro_init_args {
167			coro_func func;
168			void *arg;
169			coro_context self, main;
170			};
171
172			pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
173
174			static void *
175			trampoline (void *args_)
176			{
177			struct coro_init_args args = (struct coro_init_args )args_;
178			coro_func func = args->func;
179			void *arg = args->arg;
180
181			pthread_mutex_lock (&coro_mutex);
182			pthread_cond_destroy (&args->self->c);
183			coro_transfer (args->self, args->main);
184			func (arg);
185			pthread_mutex_unlock (&coro_mutex);
186
187			return 0;
188			}
189
190			void coro_transfer(coro_context prev, coro_context next)
191			{
192			pthread_cond_init (&prev->c, 0);
193			pthread_cond_signal (&next->c);
194			pthread_cond_wait (&prev->c, &coro_mutex);
195			pthread_cond_destroy (&prev->c);
196			}
197
198			#endif
199
200	root	1.1	/* initialize a machine state */
201	root	1.23	void coro_create (coro_context *ctx,
202			coro_func coro, void *arg,
203			void *sptr, long ssize)
204	root	1.1	{
205			#if CORO_UCONTEXT
206
207			getcontext (&(ctx->uc));
208
209	root	1.5	ctx->uc.uc_link = 0;
210	root	1.9	ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
211	root	1.8	ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
212	root	1.1	ctx->uc.uc_stack.ss_flags = 0;
213
214			makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
215
216	root	1.27	#elif CORO_SJLJ \|\| CORO_LOSER \|\| CORO_LINUX \|\| CORO_IRIX \|\| CORO_ASM
217	root	1.1
218			# if CORO_SJLJ
219			stack_t ostk, nstk;
220			struct sigaction osa, nsa;
221			sigset_t nsig, osig;
222			# endif
223			coro_context nctx;
224
225			coro_init_func = coro;
226			coro_init_arg = arg;
227
228			new_coro = ctx;
229			create_coro = &nctx;
230
231			# if CORO_SJLJ
232			/* we use SIGUSR2. first block it, then fiddle with it. */
233
234			sigemptyset (&nsig);
235			sigaddset (&nsig, SIGUSR2);
236			sigprocmask (SIG_BLOCK, &nsig, &osig);
237
238			nsa.sa_handler = trampoline;
239			sigemptyset (&nsa.sa_mask);
240			nsa.sa_flags = SA_ONSTACK;
241
242			if (sigaction (SIGUSR2, &nsa, &osa))
243	root	1.23	{
244			perror ("sigaction");
245			abort ();
246			}
247	root	1.1
248			/* set the new stack */
249	root	1.9	nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
250	root	1.8	nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
251	root	1.1	nstk.ss_flags = 0;
252
253			if (sigaltstack (&nstk, &ostk) < 0)
254	root	1.23	{
255			perror ("sigaltstack");
256			abort ();
257			}
258	root	1.1
259			trampoline_count = 0;
260			kill (getpid (), SIGUSR2);
261			sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
262
263			while (!trampoline_count)
264			sigsuspend (&nsig);
265
266			sigaltstack (0, &nstk);
267			nstk.ss_flags = SS_DISABLE;
268			if (sigaltstack (&nstk, 0) < 0)
269			perror ("sigaltstack");
270
271			sigaltstack (0, &nstk);
272			if (~nstk.ss_flags & SS_DISABLE)
273			abort ();
274
275			if (~ostk.ss_flags & SS_DISABLE)
276			sigaltstack (&ostk, 0);
277
278	root	1.19	sigaction (SIGUSR2, &osa, 0);
279	root	1.1
280			sigprocmask (SIG_SETMASK, &osig, 0);
281
282	root	1.16	# elif CORO_LOSER
283	root	1.1
284	root	1.4	setjmp (ctx->env);
285	root	1.21	#if __CYGWIN__
286	pcg	1.11	ctx->env[7] = (long)((char *)sptr + ssize);
287			ctx->env[8] = (long)coro_init;
288	root	1.21	#elif defined(_M_IX86)
289			((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
290	root	1.31	((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
291	root	1.21	#elif defined(_M_AMD64)
292			((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
293	root	1.31	((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
294	root	1.21	#elif defined(_M_IA64)
295			((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
296	root	1.31	((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
297	root	1.21	#else
298	root	1.30	# error "microsoft libc or architecture not supported"
299	root	1.21	#endif
300	root	1.4
301			# elif CORO_LINUX
302
303	root	1.22	_setjmp (ctx->env);
304	root	1.24	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
305	root	1.10	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
306	root	1.24	ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
307			#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
308	root	1.4	ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
309			ctx->env[0].__jmpbuf[0].__sp = (int )((char )sptr + ssize);
310	root	1.24	#elif defined (__GNU_LIBRARY__) && defined (__i386__)
311	root	1.4	ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
312			ctx->env[0].__jmpbuf[0].__sp = (void )((char )sptr + ssize);
313	root	1.24	#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
314	root	1.12	ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
315	root	1.24	ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
316	root	1.4	#else
317	root	1.27	# error "linux libc or architecture not supported"
318	root	1.4	#endif
319	root	1.5
320			# elif CORO_IRIX
321
322			setjmp (ctx->env);
323	root	1.6	ctx->env[JB_PC] = (__uint64_t)coro_init;
324	root	1.24	ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
325	root	1.1
326	root	1.27	# elif CORO_ASM
327
328			ctx->sp = (volatile void *)(ssize + (char )sptr);
329			--ctx->sp = (void )coro_init;
330			--ctx->sp = (void )coro_init; // this is needed when the prologue saves ebp
331	root	1.32	ctx->sp -= NUM_SAVED;
332	root	1.27
333	root	1.1	# endif
334
335	root	1.2	coro_transfer ((coro_context )create_coro, (coro_context )new_coro);
336	root	1.1
337	root	1.30	# elif CORO_PTHREAD
338
339			pthread_t id;
340			pthread_attr_t attr;
341			coro_context nctx;
342			struct coro_init_args args;
343			static int once;
344
345			if (!once)
346			{
347			pthread_mutex_lock (&coro_mutex);
348			once = 1;
349			}
350
351			args.func = coro;
352			args.arg = arg;
353			args.self = ctx;
354			args.main = &nctx;
355
356			pthread_attr_init (&attr);
357			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
358			pthread_attr_setstack (&attr, sptr, (size_t)ssize);
359			pthread_create (&id, &attr, trampoline, &args);
360
361			pthread_cond_init (&args.self->c, 0);
362			coro_transfer (args.main, args.self);
363
364	root	1.1	#else
365	root	1.30	# error unsupported backend
366	root	1.1	#endif
367			}
368