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28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
29 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
29 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
31 | * |
31 | * |
32 | * This coroutine library is very much stripped down. You should either |
32 | * This coroutine library is very much stripped down. You should either |
33 | * build your own process avstraction using it or - better - just use GNU |
33 | * build your own process abstraction using it or - better - just use GNU |
34 | * Portable Threads, http://www.gnu.org/software/pth/. |
34 | * Portable Threads, http://www.gnu.org/software/pth/. |
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35 | * |
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36 | * VERSION: 0.1 |
35 | */ |
37 | */ |
36 | |
38 | |
37 | #ifndef CORO_H |
39 | #ifndef CORO_H |
38 | #define CORO_H |
40 | #define CORO_H |
39 | |
41 | |
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55 | * |
57 | * |
56 | * This flavour uses SUSv'2 setjmp/longjmp and sigaltstack functions to |
58 | * This flavour uses SUSv'2 setjmp/longjmp and sigaltstack functions to |
57 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
59 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
58 | * context switching is often a bit cheaper. It should work on almost |
60 | * context switching is often a bit cheaper. It should work on almost |
59 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
61 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
60 | * do not work with any model (neither sigaltstack nor context functions |
62 | * do not work with any sane model (neither sigaltstack nor context |
61 | * are implemented) |
63 | * functions are implemented) |
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64 | * |
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65 | * -DCORO_LINUX |
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66 | * |
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67 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
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68 | * (very fast). |
62 | * |
69 | * |
63 | * -DCORO_LOOSE |
70 | * -DCORO_LOOSE |
64 | * |
71 | * |
65 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
72 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
66 | * this automatically selects a suitable workaround for this platform. |
73 | * this automatically selects a suitable workaround for this platform. |
67 | * (untested) |
74 | * (untested) |
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75 | * |
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76 | * -DCORO_IRIX |
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77 | * |
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78 | * SGI's version of Microsoft's NT ;) |
68 | * |
79 | * |
69 | * If you define neither of these symbols, coro.h will try to autodetect |
80 | * If you define neither of these symbols, coro.h will try to autodetect |
70 | * the model. This currently works for CORO_LOOSE only. For the other |
81 | * the model. This currently works for CORO_LOOSE only. For the other |
71 | * alternatives you should check (e.g. using autoconf) and define the |
82 | * alternatives you should check (e.g. using autoconf) and define the |
72 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
83 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
73 | */ |
84 | */ |
74 | |
85 | |
75 | /* |
86 | /* |
76 | * This is the type for the top function of a new coroutine. |
87 | * This is the type for the initialization function of a new coroutine. |
77 | */ |
88 | */ |
78 | typedef void (*coro_func)(void *); |
89 | typedef void (*coro_func)(void *); |
79 | |
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80 | |
90 | |
81 | /* |
91 | /* |
82 | * A coroutine state is saved in the following structure. Treat it as a |
92 | * A coroutine state is saved in the following structure. Treat it as a |
83 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
93 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
84 | * implement your own switching primitive. |
94 | * implement your own switching primitive. |
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91 | * and the single pointer value that is given to it as argument. |
101 | * and the single pointer value that is given to it as argument. |
92 | * |
102 | * |
93 | * Allocating/deallocating the stack is your own responsibility, so there is |
103 | * Allocating/deallocating the stack is your own responsibility, so there is |
94 | * no coro_destroy function. |
104 | * no coro_destroy function. |
95 | */ |
105 | */ |
96 | void coro_create(coro_context *ctx, |
106 | void coro_create (coro_context *ctx, |
97 | coro_func coro, void *arg, |
107 | coro_func coro, void *arg, |
98 | void *sptr, long ssize); |
108 | void *sptr, long ssize); |
99 | |
109 | |
100 | /* |
110 | /* |
101 | * The following prototype defines the coroutine switching function. It is |
111 | * The following prototype defines the coroutine switching function. It is |
102 | * usually implemented as a macro, so watch out. |
112 | * usually implemented as a macro, so watch out. |
103 | * |
113 | * |
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106 | |
116 | |
107 | /* |
117 | /* |
108 | * That was it. No other user-visible functions are implemented here. |
118 | * That was it. No other user-visible functions are implemented here. |
109 | */ |
119 | */ |
110 | |
120 | |
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121 | /*****************************************************************************/ |
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122 | |
111 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) && !defined(CORO_SJLJ) |
123 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) \ |
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124 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
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125 | && !defined(CORO_IRIX) |
112 | # if defined(WINDOWS) |
126 | # if defined(WINDOWS) |
113 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
127 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
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128 | # elif defined(__linux) && defined(__x86) |
114 | # elif defined(HAVE_UCONTEXT_H) |
129 | # elif defined(HAVE_UCONTEXT_H) |
115 | # define CORO_UCONTEXT 1 |
130 | # define CORO_UCONTEXT 1 |
116 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
131 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
117 | # define CORO_SJLJ 1 |
132 | # define CORO_SJLJ 1 |
118 | # else |
133 | # else |
119 | error unknown or unsupported architecture |
134 | error unknown or unsupported architecture |
120 | # endif |
135 | # endif |
121 | #endif |
136 | #endif |
122 | |
137 | |
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138 | /*****************************************************************************/ |
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139 | |
123 | #if CORO_UCONTEXT |
140 | #if CORO_UCONTEXT |
124 | |
141 | |
125 | #include <ucontext.h> |
142 | #include <ucontext.h> |
126 | |
143 | |
127 | struct coro_context { |
144 | struct coro_context { |
128 | ucontext_t uc; |
145 | ucontext_t uc; |
129 | }; |
146 | }; |
130 | |
147 | |
131 | #define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) |
148 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
132 | |
149 | |
133 | #elif CORO_SJLJ || CORO_LOOSE |
150 | #elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX |
134 | |
151 | |
135 | #include <setjmp.h> |
152 | #include <setjmp.h> |
136 | |
153 | |
137 | struct coro_context { |
154 | struct coro_context { |
138 | jmp_buf env; |
155 | jmp_buf env; |
139 | }; |
156 | }; |
140 | |
157 | |
141 | #define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) |
158 | #define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
142 | |
159 | |
143 | #endif |
160 | #endif |
144 | |
161 | |
145 | #endif |
162 | #endif |
146 | |
163 | |