1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2005 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 | * |
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14 | * 3. The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
13 | * |
17 | * 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 |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 | * 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- |
… | |
… | |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * |
24 | * |
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25 | * Alternatively, the contents of this file may be used under the terms of |
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26 | * the GNU General Public License ("GPL") version 2 or any later version, |
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27 | * in which case the provisions of the GPL are applicable instead of |
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28 | * the above. If you wish to allow the use of your version of this file |
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29 | * only under the terms of the GPL and not to allow others to use your |
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30 | * version of this file under the BSD license, indicate your decision |
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31 | * by deleting the provisions above and replace them with the notice |
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32 | * and other provisions required by the GPL. If you do not delete the |
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33 | * provisions above, a recipient may use your version of this file under |
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34 | * either the BSD or the GPL. |
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35 | * |
28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
36 | * 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 |
37 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
38 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
31 | */ |
39 | */ |
32 | |
40 | |
33 | #include "coro.h" |
41 | #include "coro.h" |
34 | |
42 | |
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43 | #include <string.h> |
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44 | |
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45 | /*****************************************************************************/ |
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46 | /* ucontext/setjmp/asm backends */ |
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47 | /*****************************************************************************/ |
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48 | #if CORO_UCONTEXT || CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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49 | |
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50 | # if CORO_UCONTEXT |
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51 | # include <stddef.h> |
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52 | # endif |
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53 | |
35 | #if !defined(STACK_ADJUST_PTR) |
54 | # if !defined(STACK_ADJUST_PTR) |
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55 | # if __sgi |
36 | /* IRIX is decidedly NON-unix */ |
56 | /* IRIX is decidedly NON-unix */ |
37 | # if __sgi |
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38 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
57 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
39 | # define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
58 | # define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
40 | # elif __i386__ && CORO_LINUX |
59 | # elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
41 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
60 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
42 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
61 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
43 | # else |
62 | # elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
44 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
63 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
45 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
64 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
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65 | # else |
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66 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
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67 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
46 | # endif |
68 | # endif |
47 | #endif |
69 | # endif |
48 | |
70 | |
49 | #if CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX |
71 | # include <stdlib.h> |
50 | |
72 | |
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73 | # if CORO_SJLJ |
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74 | # include <stdio.h> |
51 | #include <signal.h> |
75 | # include <signal.h> |
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76 | # include <unistd.h> |
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77 | # endif |
52 | |
78 | |
53 | static volatile coro_func coro_init_func; |
79 | static coro_func coro_init_func; |
54 | static volatile void *coro_init_arg; |
80 | static void *coro_init_arg; |
55 | static volatile coro_context *new_coro, *create_coro; |
81 | static coro_context *new_coro, *create_coro; |
56 | |
82 | |
57 | static void |
83 | static void |
58 | coro_init (void) |
84 | coro_init (void) |
59 | { |
85 | { |
60 | volatile coro_func func = coro_init_func; |
86 | volatile coro_func func = coro_init_func; |
61 | volatile void *arg = coro_init_arg; |
87 | volatile void *arg = coro_init_arg; |
62 | |
88 | |
63 | coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); |
89 | coro_transfer (new_coro, create_coro); |
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90 | |
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91 | #if __linux && __amd64 |
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92 | /* we blindly assume on any __linux with __amd64 we have a new enough gas with .cfi_undefined support */ |
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93 | asm (".cfi_undefined rip"); |
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94 | #endif |
64 | |
95 | |
65 | func ((void *)arg); |
96 | func ((void *)arg); |
66 | |
97 | |
67 | /* the new coro returned. bad. just abort() for now */ |
98 | /* the new coro returned. bad. just abort() for now */ |
68 | abort (); |
99 | abort (); |
69 | } |
100 | } |
70 | |
101 | |
71 | # if CORO_SJLJ |
102 | # if CORO_SJLJ |
72 | |
103 | |
73 | static volatile int trampoline_count; |
104 | static volatile int trampoline_done; |
74 | |
105 | |
75 | /* trampoline signal handler */ |
106 | /* trampoline signal handler */ |
76 | static void |
107 | static void |
77 | trampoline(int sig) |
108 | trampoline (int sig) |
78 | { |
109 | { |
79 | if (setjmp (((coro_context *)new_coro)->env)) |
110 | if (coro_setjmp (new_coro->env)) |
80 | coro_init (); /* start it */ |
111 | coro_init (); /* start it */ |
81 | else |
112 | else |
82 | trampoline_count++; |
113 | trampoline_done = 1; |
83 | } |
114 | } |
84 | |
115 | |
85 | # endif |
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86 | |
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87 | #endif |
116 | # endif |
88 | |
117 | |
89 | /* initialize a machine state */ |
118 | # if CORO_ASM |
90 | void coro_create(coro_context *ctx, |
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91 | coro_func coro, void *arg, |
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92 | void *sptr, long ssize) |
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93 | { |
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94 | #if CORO_UCONTEXT |
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95 | |
119 | |
96 | getcontext (&(ctx->uc)); |
120 | asm ( |
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121 | ".text\n" |
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122 | ".globl coro_transfer\n" |
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123 | ".type coro_transfer, @function\n" |
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124 | "coro_transfer:\n" |
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125 | /* windows, of course, gives a shit on the amd64 ABI and uses different registers */ |
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126 | /* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */ |
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127 | #if __amd64 |
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128 | #define NUM_SAVED 6 |
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129 | "\tpush %rbp\n" |
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130 | "\tpush %rbx\n" |
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131 | "\tpush %r12\n" |
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132 | "\tpush %r13\n" |
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133 | "\tpush %r14\n" |
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134 | "\tpush %r15\n" |
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135 | #if CORO_WIN_TIB |
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136 | "\tpush %gs:0x0\n" |
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137 | "\tpush %gs:0x8\n" |
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138 | "\tpush %gs:0xc\n" |
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139 | #endif |
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140 | "\tmov %rsp, (%rdi)\n" |
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141 | "\tmov (%rsi), %rsp\n" |
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142 | #if CORO_WIN_TIB |
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143 | "\tpop %gs:0xc\n" |
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144 | "\tpop %gs:0x8\n" |
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145 | "\tpop %gs:0x0\n" |
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146 | #endif |
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147 | "\tpop %r15\n" |
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148 | "\tpop %r14\n" |
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149 | "\tpop %r13\n" |
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150 | "\tpop %r12\n" |
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151 | "\tpop %rbx\n" |
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152 | "\tpop %rbp\n" |
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153 | #elif __i386 |
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154 | #define NUM_SAVED 4 |
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155 | "\tpush %ebp\n" |
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156 | "\tpush %ebx\n" |
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157 | "\tpush %esi\n" |
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158 | "\tpush %edi\n" |
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159 | #if CORO_WIN_TIB |
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160 | "\tpush %fs:0\n" |
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161 | "\tpush %fs:4\n" |
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162 | "\tpush %fs:8\n" |
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163 | #endif |
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164 | "\tmov %esp, (%eax)\n" |
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165 | "\tmov (%edx), %esp\n" |
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166 | #if CORO_WIN_TIB |
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167 | "\tpop %fs:8\n" |
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168 | "\tpop %fs:4\n" |
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169 | "\tpop %fs:0\n" |
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170 | #endif |
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171 | "\tpop %edi\n" |
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172 | "\tpop %esi\n" |
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173 | "\tpop %ebx\n" |
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174 | "\tpop %ebp\n" |
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175 | #else |
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176 | #error unsupported architecture |
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177 | #endif |
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178 | "\tret\n" |
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179 | ); |
97 | |
180 | |
98 | ctx->uc.uc_link = 0; |
181 | # endif |
99 | ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
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100 | ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); |
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101 | ctx->uc.uc_stack.ss_flags = 0; |
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102 | |
182 | |
103 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
183 | void |
104 | |
184 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
105 | #elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX |
185 | { |
106 | |
186 | coro_context nctx; |
107 | # if CORO_SJLJ |
187 | # if CORO_SJLJ |
108 | stack_t ostk, nstk; |
188 | stack_t ostk, nstk; |
109 | struct sigaction osa, nsa; |
189 | struct sigaction osa, nsa; |
110 | sigset_t nsig, osig; |
190 | sigset_t nsig, osig; |
111 | # endif |
191 | # endif |
112 | coro_context nctx; |
192 | |
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193 | if (!coro) |
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194 | return; |
113 | |
195 | |
114 | coro_init_func = coro; |
196 | coro_init_func = coro; |
115 | coro_init_arg = arg; |
197 | coro_init_arg = arg; |
116 | |
198 | |
117 | new_coro = ctx; |
199 | new_coro = ctx; |
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127 | nsa.sa_handler = trampoline; |
209 | nsa.sa_handler = trampoline; |
128 | sigemptyset (&nsa.sa_mask); |
210 | sigemptyset (&nsa.sa_mask); |
129 | nsa.sa_flags = SA_ONSTACK; |
211 | nsa.sa_flags = SA_ONSTACK; |
130 | |
212 | |
131 | if (sigaction (SIGUSR2, &nsa, &osa)) |
213 | if (sigaction (SIGUSR2, &nsa, &osa)) |
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214 | { |
132 | perror ("sigaction"); |
215 | perror ("sigaction"); |
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216 | abort (); |
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217 | } |
133 | |
218 | |
134 | /* set the new stack */ |
219 | /* set the new stack */ |
135 | nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
220 | nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
136 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
221 | nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
137 | nstk.ss_flags = 0; |
222 | nstk.ss_flags = 0; |
138 | |
223 | |
139 | if (sigaltstack (&nstk, &ostk) < 0) |
224 | if (sigaltstack (&nstk, &ostk) < 0) |
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225 | { |
140 | perror ("sigaltstack"); |
226 | perror ("sigaltstack"); |
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227 | abort (); |
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228 | } |
141 | |
229 | |
142 | trampoline_count = 0; |
230 | trampoline_done = 0; |
143 | kill (getpid (), SIGUSR2); |
231 | kill (getpid (), SIGUSR2); |
144 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
232 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
145 | |
233 | |
146 | while (!trampoline_count) |
234 | while (!trampoline_done) |
147 | sigsuspend (&nsig); |
235 | sigsuspend (&nsig); |
148 | |
236 | |
149 | sigaltstack (0, &nstk); |
237 | sigaltstack (0, &nstk); |
150 | nstk.ss_flags = SS_DISABLE; |
238 | nstk.ss_flags = SS_DISABLE; |
151 | if (sigaltstack (&nstk, 0) < 0) |
239 | if (sigaltstack (&nstk, 0) < 0) |
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156 | abort (); |
244 | abort (); |
157 | |
245 | |
158 | if (~ostk.ss_flags & SS_DISABLE) |
246 | if (~ostk.ss_flags & SS_DISABLE) |
159 | sigaltstack (&ostk, 0); |
247 | sigaltstack (&ostk, 0); |
160 | |
248 | |
161 | sigaction (SIGUSR1, &osa, 0); |
249 | sigaction (SIGUSR2, &osa, 0); |
162 | |
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163 | sigprocmask (SIG_SETMASK, &osig, 0); |
250 | sigprocmask (SIG_SETMASK, &osig, 0); |
164 | |
251 | |
165 | # elif CORO_LOOSE |
252 | # elif CORO_LOSER |
166 | |
253 | |
167 | setjmp (ctx->env); |
254 | coro_setjmp (ctx->env); |
168 | ctx->env[7] = (long)((char *)sptr + ssize); |
255 | #if __CYGWIN__ && __i386 |
169 | ctx->env[8] = (long)coro_init; |
256 | ctx->env[8] = (long) coro_init; |
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257 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
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258 | #elif __CYGWIN__ && __x86_64 |
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259 | ctx->env[7] = (long) coro_init; |
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260 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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261 | #elif defined(__MINGW32__) |
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262 | ctx->env[5] = (long) coro_init; |
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263 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
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264 | #elif defined(_M_IX86) |
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265 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
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266 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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267 | #elif defined(_M_AMD64) |
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268 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
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269 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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270 | #elif defined(_M_IA64) |
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271 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
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272 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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273 | #else |
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274 | #error "microsoft libc or architecture not supported" |
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275 | #endif |
170 | |
276 | |
171 | # elif CORO_LINUX |
277 | # elif CORO_LINUX |
172 | |
278 | |
173 | setjmp (ctx->env); |
279 | coro_setjmp (ctx->env); |
174 | #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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175 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) |
280 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
176 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
281 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
177 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); |
282 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
178 | #elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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179 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) |
283 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
180 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
284 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
181 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
285 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
182 | #elif defined(__GNU_LIBRARY__) && defined(__i386__) |
286 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
183 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
287 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
184 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
288 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
185 | #elif defined(__GNU_LIBRARY__) && defined(__amd64__) |
289 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
186 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
290 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
187 | ctx->env[0].__jmpbuf[JB_RSP] = (long)((char *)sptr + ssize); |
291 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
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292 | #else |
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293 | #error "linux libc or architecture not supported" |
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294 | #endif |
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295 | |
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296 | # elif CORO_IRIX |
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297 | |
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298 | coro_setjmp (ctx->env, 0); |
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299 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
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300 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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301 | |
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302 | # elif CORO_ASM |
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303 | |
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304 | ctx->sp = (void **)(ssize + (char *)sptr); |
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305 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
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306 | *--ctx->sp = (void *)coro_init; |
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307 | |
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308 | #if CORO_WIN_TIB |
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309 | *--ctx->sp = 0; /* ExceptionList */ |
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310 | *--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
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311 | *--ctx->sp = sptr; /* StackLimit */ |
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312 | #endif |
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313 | |
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314 | ctx->sp -= NUM_SAVED; |
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315 | memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
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316 | |
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317 | # elif CORO_UCONTEXT |
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318 | |
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319 | getcontext (&(ctx->uc)); |
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320 | |
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321 | ctx->uc.uc_link = 0; |
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322 | ctx->uc.uc_stack.ss_sp = sptr; |
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323 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
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324 | ctx->uc.uc_stack.ss_flags = 0; |
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325 | |
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326 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
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327 | |
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328 | # endif |
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329 | |
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330 | coro_transfer (create_coro, new_coro); |
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331 | } |
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332 | |
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333 | /*****************************************************************************/ |
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334 | /* pthread backend */ |
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335 | /*****************************************************************************/ |
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336 | #elif CORO_PTHREAD |
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337 | |
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338 | /* this mutex will be locked by the running coroutine */ |
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339 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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340 | |
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341 | struct coro_init_args |
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342 | { |
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343 | coro_func func; |
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344 | void *arg; |
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345 | coro_context *self, *main; |
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346 | }; |
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347 | |
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348 | static pthread_t null_tid; |
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349 | |
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350 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
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351 | static void |
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352 | mutex_unlock_wrapper (void *arg) |
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353 | { |
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354 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
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355 | } |
|
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356 | |
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357 | static void * |
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358 | coro_init (void *args_) |
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359 | { |
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360 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
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361 | coro_func func = args->func; |
|
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362 | void *arg = args->arg; |
|
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363 | |
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364 | pthread_mutex_lock (&coro_mutex); |
|
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365 | |
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366 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
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367 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
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368 | coro_transfer (args->self, args->main); |
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369 | func (arg); |
|
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370 | pthread_cleanup_pop (1); |
|
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371 | |
|
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372 | return 0; |
|
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373 | } |
|
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374 | |
|
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375 | void |
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376 | coro_transfer (coro_context *prev, coro_context *next) |
|
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377 | { |
|
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378 | pthread_cond_signal (&next->cv); |
|
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379 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
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380 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
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381 | pthread_testcancel (); |
|
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382 | #endif |
|
|
383 | } |
|
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384 | |
|
|
385 | void |
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386 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
|
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387 | { |
|
|
388 | static coro_context nctx; |
|
|
389 | static int once; |
|
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390 | |
|
|
391 | if (!once) |
|
|
392 | { |
|
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393 | once = 1; |
|
|
394 | |
|
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395 | pthread_mutex_lock (&coro_mutex); |
|
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396 | pthread_cond_init (&nctx.cv, 0); |
|
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397 | null_tid = pthread_self (); |
|
|
398 | } |
|
|
399 | |
|
|
400 | pthread_cond_init (&ctx->cv, 0); |
|
|
401 | |
|
|
402 | if (coro) |
|
|
403 | { |
|
|
404 | pthread_attr_t attr; |
|
|
405 | struct coro_init_args args; |
|
|
406 | |
|
|
407 | args.func = coro; |
|
|
408 | args.arg = arg; |
|
|
409 | args.self = ctx; |
|
|
410 | args.main = &nctx; |
|
|
411 | |
|
|
412 | pthread_attr_init (&attr); |
|
|
413 | #if __UCLIBC__ |
|
|
414 | /* exists, but is borked */ |
|
|
415 | /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
188 | #else |
416 | #else |
189 | #error "linux libc or architecture not supported" |
417 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
190 | #endif |
418 | #endif |
|
|
419 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
|
|
420 | pthread_create (&ctx->id, &attr, coro_init, &args); |
191 | |
421 | |
192 | # elif CORO_IRIX |
422 | coro_transfer (args.main, args.self); |
|
|
423 | } |
|
|
424 | else |
|
|
425 | ctx->id = null_tid; |
|
|
426 | } |
193 | |
427 | |
194 | setjmp (ctx->env); |
428 | void |
195 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
429 | coro_destroy (coro_context *ctx) |
196 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize); |
430 | { |
|
|
431 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
432 | { |
|
|
433 | pthread_cancel (ctx->id); |
|
|
434 | pthread_mutex_unlock (&coro_mutex); |
|
|
435 | pthread_join (ctx->id, 0); |
|
|
436 | pthread_mutex_lock (&coro_mutex); |
|
|
437 | } |
197 | |
438 | |
198 | # endif |
439 | pthread_cond_destroy (&ctx->cv); |
199 | |
440 | } |
200 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
|
|
201 | |
441 | |
202 | #else |
442 | #else |
203 | error unsupported architecture |
443 | # error unsupported backend |
204 | #endif |
444 | #endif |
205 | } |
|
|
206 | |
445 | |