1 |
root |
1.1 |
/* |
2 |
root |
1.23 |
* 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 |
1.24 |
* 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 |
1.24 |
* 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 |
|
|
* This coroutine library is very much stripped down. You should either |
41 |
pcg |
1.7 |
* build your own process abstraction using it or - better - just use GNU |
42 |
root |
1.1 |
* Portable Threads, http://www.gnu.org/software/pth/. |
43 |
root |
1.4 |
* |
44 |
root |
1.1 |
*/ |
45 |
|
|
|
46 |
root |
1.14 |
/* |
47 |
|
|
* 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
48 |
|
|
* Reported by Michael_G_Schwern. |
49 |
root |
1.17 |
* 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
50 |
root |
1.20 |
* 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
51 |
root |
1.21 |
* Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
52 |
root |
1.22 |
* 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
53 |
|
|
* on SIGUSR2 and sigaltstack in Crossfire). |
54 |
root |
1.23 |
* 2008-01-21 Disable CFI usage on anything but GNU/Linux. |
55 |
root |
1.24 |
* 2008-03-02 Switched to 2-clause BSD license with GPL exception. |
56 |
root |
1.25 |
* 2008-04-04 New (but highly unrecommended) pthreads backend. |
57 |
root |
1.26 |
* 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments). |
58 |
root |
1.28 |
* 2008-10-30 Support assembly method on x86 with and without frame pointer. |
59 |
root |
1.29 |
* 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn. |
60 |
root |
1.14 |
*/ |
61 |
|
|
|
62 |
root |
1.1 |
#ifndef CORO_H |
63 |
|
|
#define CORO_H |
64 |
|
|
|
65 |
root |
1.11 |
#define CORO_VERSION 2 |
66 |
|
|
|
67 |
|
|
/* |
68 |
|
|
* Changes since API version 1: |
69 |
root |
1.12 |
* replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
70 |
root |
1.11 |
*/ |
71 |
root |
1.9 |
|
72 |
root |
1.2 |
/* |
73 |
|
|
* This library consists of only three files |
74 |
root |
1.9 |
* coro.h, coro.c and LICENSE (and optionally README) |
75 |
root |
1.2 |
* |
76 |
|
|
* It implements what is known as coroutines, in a hopefully |
77 |
|
|
* portable way. At the moment you have to define which kind |
78 |
|
|
* of implementation flavour you want: |
79 |
|
|
* |
80 |
|
|
* -DCORO_UCONTEXT |
81 |
|
|
* |
82 |
|
|
* This flavour uses SUSv2's get/set/swap/makecontext functions that |
83 |
|
|
* unfortunately only newer unices support. |
84 |
|
|
* |
85 |
|
|
* -DCORO_SJLJ |
86 |
|
|
* |
87 |
root |
1.13 |
* This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
88 |
root |
1.2 |
* do it's job. Coroutine creation is much slower than UCONTEXT, but |
89 |
|
|
* context switching is often a bit cheaper. It should work on almost |
90 |
root |
1.24 |
* all unices. |
91 |
root |
1.3 |
* |
92 |
|
|
* -DCORO_LINUX |
93 |
|
|
* |
94 |
root |
1.24 |
* Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
95 |
|
|
* (it is very fast and therefore recommended over other methods, but |
96 |
|
|
* doesn't work with anything newer). |
97 |
root |
1.2 |
* |
98 |
root |
1.11 |
* -DCORO_LOSER |
99 |
root |
1.2 |
* |
100 |
|
|
* Microsoft's highly proprietary platform doesn't support sigaltstack, and |
101 |
|
|
* this automatically selects a suitable workaround for this platform. |
102 |
|
|
* (untested) |
103 |
|
|
* |
104 |
root |
1.5 |
* -DCORO_IRIX |
105 |
|
|
* |
106 |
|
|
* SGI's version of Microsoft's NT ;) |
107 |
|
|
* |
108 |
root |
1.22 |
* -DCORO_ASM |
109 |
|
|
* |
110 |
|
|
* Handcoded assembly, known to work only on a few architectures/ABI: |
111 |
|
|
* ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
112 |
|
|
* |
113 |
root |
1.25 |
* -DCORO_PTHREAD |
114 |
|
|
* |
115 |
|
|
* Use the pthread API. You have to provide <pthread.h> and -lpthread. |
116 |
|
|
* |
117 |
root |
1.2 |
* If you define neither of these symbols, coro.h will try to autodetect |
118 |
root |
1.24 |
* the model. This currently works for CORO_LOSER only. For the other |
119 |
root |
1.2 |
* alternatives you should check (e.g. using autoconf) and define the |
120 |
|
|
* following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
121 |
|
|
*/ |
122 |
|
|
|
123 |
|
|
/* |
124 |
root |
1.6 |
* This is the type for the initialization function of a new coroutine. |
125 |
root |
1.2 |
*/ |
126 |
root |
1.1 |
typedef void (*coro_func)(void *); |
127 |
root |
1.2 |
|
128 |
|
|
/* |
129 |
root |
1.19 |
* A coroutine state is saved in the following structure. Treat it as an |
130 |
root |
1.2 |
* opaque type. errno and sigmask might be saved, but don't rely on it, |
131 |
root |
1.19 |
* implement your own switching primitive if you need that. |
132 |
root |
1.2 |
*/ |
133 |
|
|
typedef struct coro_context coro_context; |
134 |
|
|
|
135 |
|
|
/* |
136 |
|
|
* This function creates a new coroutine. Apart from a pointer to an |
137 |
root |
1.13 |
* uninitialised coro_context, it expects a pointer to the entry function |
138 |
root |
1.2 |
* and the single pointer value that is given to it as argument. |
139 |
|
|
* |
140 |
|
|
* Allocating/deallocating the stack is your own responsibility, so there is |
141 |
|
|
* no coro_destroy function. |
142 |
|
|
*/ |
143 |
root |
1.19 |
void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
144 |
|
|
coro_func coro, /* the coroutine code to be executed */ |
145 |
|
|
void *arg, /* a single pointer passed to the coro */ |
146 |
|
|
void *sptr, /* start of stack area */ |
147 |
|
|
long ssize); /* size of stack area */ |
148 |
root |
1.2 |
|
149 |
|
|
/* |
150 |
|
|
* The following prototype defines the coroutine switching function. It is |
151 |
|
|
* usually implemented as a macro, so watch out. |
152 |
|
|
* |
153 |
|
|
void coro_transfer(coro_context *prev, coro_context *next); |
154 |
|
|
*/ |
155 |
|
|
|
156 |
|
|
/* |
157 |
|
|
* That was it. No other user-visible functions are implemented here. |
158 |
|
|
*/ |
159 |
|
|
|
160 |
root |
1.5 |
/*****************************************************************************/ |
161 |
|
|
|
162 |
root |
1.11 |
#if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
163 |
root |
1.5 |
&& !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
164 |
root |
1.25 |
&& !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
165 |
|
|
&& !defined(CORO_PTHREAD) |
166 |
root |
1.2 |
# if defined(WINDOWS) |
167 |
root |
1.11 |
# define CORO_LOSER 1 /* you don't win with windoze */ |
168 |
root |
1.22 |
# elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
169 |
|
|
# define CORO_ASM 1 |
170 |
root |
1.2 |
# elif defined(HAVE_UCONTEXT_H) |
171 |
|
|
# define CORO_UCONTEXT 1 |
172 |
|
|
# elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
173 |
|
|
# define CORO_SJLJ 1 |
174 |
|
|
# else |
175 |
root |
1.1 |
error unknown or unsupported architecture |
176 |
root |
1.2 |
# endif |
177 |
root |
1.1 |
#endif |
178 |
|
|
|
179 |
root |
1.5 |
/*****************************************************************************/ |
180 |
|
|
|
181 |
root |
1.1 |
#if CORO_UCONTEXT |
182 |
|
|
|
183 |
root |
1.22 |
# include <ucontext.h> |
184 |
root |
1.1 |
|
185 |
root |
1.2 |
struct coro_context { |
186 |
root |
1.1 |
ucontext_t uc; |
187 |
root |
1.2 |
}; |
188 |
root |
1.1 |
|
189 |
root |
1.22 |
# define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
190 |
root |
1.1 |
|
191 |
root |
1.11 |
#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
192 |
root |
1.1 |
|
193 |
root |
1.22 |
# if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
194 |
|
|
# define _GNU_SOURCE /* for linux libc */ |
195 |
|
|
# endif |
196 |
root |
1.8 |
|
197 |
root |
1.22 |
# include <setjmp.h> |
198 |
root |
1.1 |
|
199 |
root |
1.2 |
struct coro_context { |
200 |
root |
1.1 |
jmp_buf env; |
201 |
root |
1.2 |
}; |
202 |
root |
1.1 |
|
203 |
root |
1.22 |
# if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
204 |
|
|
# define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
205 |
|
|
# else |
206 |
|
|
# define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
207 |
|
|
# endif |
208 |
|
|
|
209 |
|
|
#elif CORO_ASM |
210 |
|
|
|
211 |
|
|
struct coro_context { |
212 |
root |
1.29 |
volatile void **sp; /* must be at offset 0 */ |
213 |
root |
1.22 |
}; |
214 |
|
|
|
215 |
root |
1.27 |
void __attribute__ ((__noinline__, __regparm__(2))) |
216 |
root |
1.29 |
coro_transfer (coro_context *prev, coro_context *next); |
217 |
root |
1.25 |
|
218 |
|
|
#elif CORO_PTHREAD |
219 |
|
|
|
220 |
|
|
#include <pthread.h> |
221 |
|
|
|
222 |
|
|
extern pthread_mutex_t coro_mutex; |
223 |
|
|
|
224 |
|
|
struct coro_context { |
225 |
|
|
pthread_cond_t c; |
226 |
|
|
}; |
227 |
|
|
|
228 |
|
|
void coro_transfer (coro_context *prev, coro_context *next); |
229 |
root |
1.1 |
|
230 |
|
|
#endif |
231 |
|
|
|
232 |
|
|
#endif |
233 |
|
|
|