1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2006 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- |
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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 | # elif __amd64__ && CORO_LINUX |
62 | # elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
44 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
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) |
46 | # else |
65 | # else |
47 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
66 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
48 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
67 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
49 | # endif |
68 | # endif |
50 | #endif |
69 | # endif |
51 | |
70 | |
52 | #if CORO_UCONTEXT |
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53 | # include <stddef.h> |
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54 | #endif |
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55 | |
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56 | #if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
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57 | |
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58 | #include <stdlib.h> |
71 | # include <stdlib.h> |
59 | |
72 | |
60 | #if CORO_SJLJ |
73 | # if CORO_SJLJ |
61 | # include <stdio.h> |
74 | # include <stdio.h> |
62 | # include <signal.h> |
75 | # include <signal.h> |
63 | # include <unistd.h> |
76 | # include <unistd.h> |
64 | #endif |
77 | # endif |
65 | |
78 | |
66 | static volatile coro_func coro_init_func; |
79 | static coro_func coro_init_func; |
67 | static volatile void *coro_init_arg; |
80 | static void *coro_init_arg; |
68 | static volatile coro_context *new_coro, *create_coro; |
81 | static coro_context *new_coro, *create_coro; |
69 | |
82 | |
70 | static void |
83 | static void |
71 | coro_init (void) |
84 | coro_init (void) |
72 | { |
85 | { |
73 | volatile coro_func func = coro_init_func; |
86 | volatile coro_func func = coro_init_func; |
74 | volatile void *arg = coro_init_arg; |
87 | volatile void *arg = coro_init_arg; |
75 | |
88 | |
76 | 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 |
77 | |
95 | |
78 | func ((void *)arg); |
96 | func ((void *)arg); |
79 | |
97 | |
80 | /* the new coro returned. bad. just abort() for now */ |
98 | /* the new coro returned. bad. just abort() for now */ |
81 | abort (); |
99 | abort (); |
82 | } |
100 | } |
83 | |
101 | |
84 | # if CORO_SJLJ |
102 | # if CORO_SJLJ |
85 | |
103 | |
86 | static volatile int trampoline_count; |
104 | static volatile int trampoline_done; |
87 | |
105 | |
88 | /* trampoline signal handler */ |
106 | /* trampoline signal handler */ |
89 | static void |
107 | static void |
90 | trampoline (int sig) |
108 | trampoline (int sig) |
91 | { |
109 | { |
92 | if (setjmp (((coro_context *)new_coro)->env)) |
110 | if (coro_setjmp (new_coro->env)) |
93 | coro_init (); /* start it */ |
111 | coro_init (); /* start it */ |
94 | else |
112 | else |
95 | trampoline_count++; |
113 | trampoline_done = 1; |
96 | } |
114 | } |
97 | |
115 | |
98 | # endif |
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99 | |
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100 | #endif |
116 | # endif |
101 | |
117 | |
102 | /* initialize a machine state */ |
118 | # if CORO_ASM |
103 | void coro_create(coro_context *ctx, |
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104 | coro_func coro, void *arg, |
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105 | void *sptr, long ssize) |
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106 | { |
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107 | #if CORO_UCONTEXT |
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108 | |
119 | |
109 | 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 | #ifdef _WIN32 |
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129 | /* TODO: xmm6..15 also would need to be saved. sigh. */ |
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130 | #define NUM_SAVED 8 |
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131 | #undef CORO_WIN_TIB |
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132 | "\tpushq %rsi\n" |
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133 | "\tpushq %rdi\n" |
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134 | "\tpushq %rbp\n" |
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135 | "\tpushq %rbx\n" |
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136 | "\tpushq %r12\n" |
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137 | "\tpushq %r13\n" |
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138 | "\tpushq %r14\n" |
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139 | "\tpushq %r15\n" |
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140 | "\tmovq %rsp, (%rcx)\n" |
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141 | "\tmovq (%rdx), %rsp\n" |
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142 | "\tpopq %r15\n" |
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143 | "\tpopq %r14\n" |
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144 | "\tpopq %r13\n" |
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145 | "\tpopq %r12\n" |
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146 | "\tpopq %rbx\n" |
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147 | "\tpopq %rbp\n" |
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148 | "\tpopq %rdi\n" |
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149 | "\tpopq %rsi\n" |
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150 | #else |
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151 | #define NUM_SAVED 6 |
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152 | "\tpushq %rbp\n" |
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153 | "\tpushq %rbx\n" |
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154 | "\tpushq %r12\n" |
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155 | "\tpushq %r13\n" |
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156 | "\tpushq %r14\n" |
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157 | "\tpushq %r15\n" |
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158 | "\tmovq %rsp, (%rdi)\n" |
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159 | "\tmovq (%rsi), %rsp\n" |
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160 | "\tpopq %r15\n" |
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161 | "\tpopq %r14\n" |
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162 | "\tpopq %r13\n" |
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163 | "\tpopq %r12\n" |
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164 | "\tpopq %rbx\n" |
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165 | "\tpopq %rbp\n" |
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166 | #endif |
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167 | #elif __i386 |
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168 | #define NUM_SAVED 4 |
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169 | "\tpushl %ebp\n" |
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170 | "\tpushl %ebx\n" |
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171 | "\tpushl %esi\n" |
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172 | "\tpushl %edi\n" |
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173 | #if CORO_WIN_TIB |
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174 | "\tpushl %fs:0\n" |
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175 | "\tpushl %fs:4\n" |
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176 | "\tpushl %fs:8\n" |
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177 | #endif |
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178 | "\tmovl %esp, (%eax)\n" |
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179 | "\tmovl (%edx), %esp\n" |
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180 | #if CORO_WIN_TIB |
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181 | "\tpopl %fs:8\n" |
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182 | "\tpopl %fs:4\n" |
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183 | "\tpopl %fs:0\n" |
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184 | #endif |
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185 | "\tpopl %edi\n" |
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186 | "\tpopl %esi\n" |
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187 | "\tpopl %ebx\n" |
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188 | "\tpopl %ebp\n" |
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189 | #else |
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190 | #error unsupported architecture |
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191 | #endif |
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192 | "\tret\n" |
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193 | ); |
110 | |
194 | |
111 | ctx->uc.uc_link = 0; |
195 | # endif |
112 | ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
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113 | ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); |
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114 | ctx->uc.uc_stack.ss_flags = 0; |
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115 | |
196 | |
116 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
197 | void |
117 | |
198 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
118 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
199 | { |
119 | |
200 | coro_context nctx; |
120 | # if CORO_SJLJ |
201 | # if CORO_SJLJ |
121 | stack_t ostk, nstk; |
202 | stack_t ostk, nstk; |
122 | struct sigaction osa, nsa; |
203 | struct sigaction osa, nsa; |
123 | sigset_t nsig, osig; |
204 | sigset_t nsig, osig; |
124 | # endif |
205 | # endif |
125 | coro_context nctx; |
206 | |
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207 | if (!coro) |
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208 | return; |
126 | |
209 | |
127 | coro_init_func = coro; |
210 | coro_init_func = coro; |
128 | coro_init_arg = arg; |
211 | coro_init_arg = arg; |
129 | |
212 | |
130 | new_coro = ctx; |
213 | new_coro = ctx; |
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140 | nsa.sa_handler = trampoline; |
223 | nsa.sa_handler = trampoline; |
141 | sigemptyset (&nsa.sa_mask); |
224 | sigemptyset (&nsa.sa_mask); |
142 | nsa.sa_flags = SA_ONSTACK; |
225 | nsa.sa_flags = SA_ONSTACK; |
143 | |
226 | |
144 | if (sigaction (SIGUSR2, &nsa, &osa)) |
227 | if (sigaction (SIGUSR2, &nsa, &osa)) |
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228 | { |
145 | perror ("sigaction"); |
229 | perror ("sigaction"); |
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230 | abort (); |
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231 | } |
146 | |
232 | |
147 | /* set the new stack */ |
233 | /* set the new stack */ |
148 | nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
234 | nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
149 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
235 | nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
150 | nstk.ss_flags = 0; |
236 | nstk.ss_flags = 0; |
151 | |
237 | |
152 | if (sigaltstack (&nstk, &ostk) < 0) |
238 | if (sigaltstack (&nstk, &ostk) < 0) |
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239 | { |
153 | perror ("sigaltstack"); |
240 | perror ("sigaltstack"); |
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241 | abort (); |
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242 | } |
154 | |
243 | |
155 | trampoline_count = 0; |
244 | trampoline_done = 0; |
156 | kill (getpid (), SIGUSR2); |
245 | kill (getpid (), SIGUSR2); |
157 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
246 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
158 | |
247 | |
159 | while (!trampoline_count) |
248 | while (!trampoline_done) |
160 | sigsuspend (&nsig); |
249 | sigsuspend (&nsig); |
161 | |
250 | |
162 | sigaltstack (0, &nstk); |
251 | sigaltstack (0, &nstk); |
163 | nstk.ss_flags = SS_DISABLE; |
252 | nstk.ss_flags = SS_DISABLE; |
164 | if (sigaltstack (&nstk, 0) < 0) |
253 | if (sigaltstack (&nstk, 0) < 0) |
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170 | |
259 | |
171 | if (~ostk.ss_flags & SS_DISABLE) |
260 | if (~ostk.ss_flags & SS_DISABLE) |
172 | sigaltstack (&ostk, 0); |
261 | sigaltstack (&ostk, 0); |
173 | |
262 | |
174 | sigaction (SIGUSR2, &osa, 0); |
263 | sigaction (SIGUSR2, &osa, 0); |
175 | |
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176 | sigprocmask (SIG_SETMASK, &osig, 0); |
264 | sigprocmask (SIG_SETMASK, &osig, 0); |
177 | |
265 | |
178 | # elif CORO_LOSER |
266 | # elif CORO_LOSER |
179 | |
267 | |
180 | setjmp (ctx->env); |
268 | coro_setjmp (ctx->env); |
181 | ctx->env[7] = (long)((char *)sptr + ssize); |
269 | #if __CYGWIN__ && __i386 |
182 | ctx->env[8] = (long)coro_init; |
270 | ctx->env[8] = (long) coro_init; |
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271 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
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272 | #elif __CYGWIN__ && __x86_64 |
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273 | ctx->env[7] = (long) coro_init; |
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274 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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275 | #elif defined(__MINGW32__) |
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276 | ctx->env[5] = (long) coro_init; |
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277 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
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278 | #elif defined(_M_IX86) |
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279 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
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280 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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281 | #elif defined(_M_AMD64) |
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282 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
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283 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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284 | #elif defined(_M_IA64) |
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285 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
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286 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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287 | #else |
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288 | #error "microsoft libc or architecture not supported" |
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289 | #endif |
183 | |
290 | |
184 | # elif CORO_LINUX |
291 | # elif CORO_LINUX |
185 | |
292 | |
186 | setjmp (ctx->env); |
293 | coro_setjmp (ctx->env); |
187 | #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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188 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) |
294 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
189 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
295 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
190 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); |
296 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
191 | #elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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192 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) |
297 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
193 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
298 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
194 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
299 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
195 | #elif defined(__GNU_LIBRARY__) && defined(__i386__) |
300 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
196 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
301 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
197 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
302 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
198 | #elif defined(__GNU_LIBRARY__) && defined(__amd64__) |
303 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
199 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
304 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
200 | ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr,ssize); |
305 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
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306 | #else |
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307 | #error "linux libc or architecture not supported" |
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308 | #endif |
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309 | |
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310 | # elif CORO_IRIX |
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311 | |
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312 | coro_setjmp (ctx->env, 0); |
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313 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
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314 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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315 | |
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316 | # elif CORO_ASM |
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317 | |
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318 | ctx->sp = (void **)(ssize + (char *)sptr); |
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319 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
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320 | *--ctx->sp = (void *)coro_init; |
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321 | |
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322 | #if CORO_WIN_TIB |
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323 | *--ctx->sp = 0; /* ExceptionList */ |
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324 | *--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
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325 | *--ctx->sp = sptr; /* StackLimit */ |
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326 | #endif |
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327 | |
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328 | ctx->sp -= NUM_SAVED; |
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329 | memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
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330 | |
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331 | # elif CORO_UCONTEXT |
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332 | |
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333 | getcontext (&(ctx->uc)); |
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334 | |
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335 | ctx->uc.uc_link = 0; |
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336 | ctx->uc.uc_stack.ss_sp = sptr; |
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337 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
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338 | ctx->uc.uc_stack.ss_flags = 0; |
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339 | |
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340 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
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341 | |
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342 | # endif |
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343 | |
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344 | coro_transfer (create_coro, new_coro); |
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345 | } |
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346 | |
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347 | /*****************************************************************************/ |
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348 | /* pthread backend */ |
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349 | /*****************************************************************************/ |
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350 | #elif CORO_PTHREAD |
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351 | |
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352 | /* this mutex will be locked by the running coroutine */ |
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353 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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354 | |
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355 | struct coro_init_args |
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356 | { |
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357 | coro_func func; |
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358 | void *arg; |
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359 | coro_context *self, *main; |
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360 | }; |
|
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361 | |
|
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362 | static pthread_t null_tid; |
|
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363 | |
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364 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
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365 | static void |
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366 | mutex_unlock_wrapper (void *arg) |
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367 | { |
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368 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
|
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369 | } |
|
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370 | |
|
|
371 | static void * |
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372 | coro_init (void *args_) |
|
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373 | { |
|
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374 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
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375 | coro_func func = args->func; |
|
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376 | void *arg = args->arg; |
|
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377 | |
|
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378 | pthread_mutex_lock (&coro_mutex); |
|
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379 | |
|
|
380 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
|
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381 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
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382 | coro_transfer (args->self, args->main); |
|
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383 | func (arg); |
|
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384 | pthread_cleanup_pop (1); |
|
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385 | |
|
|
386 | return 0; |
|
|
387 | } |
|
|
388 | |
|
|
389 | void |
|
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390 | coro_transfer (coro_context *prev, coro_context *next) |
|
|
391 | { |
|
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392 | pthread_cond_signal (&next->cv); |
|
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393 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
|
394 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
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395 | pthread_testcancel (); |
|
|
396 | #endif |
|
|
397 | } |
|
|
398 | |
|
|
399 | void |
|
|
400 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
|
|
401 | { |
|
|
402 | static coro_context nctx; |
|
|
403 | static int once; |
|
|
404 | |
|
|
405 | if (!once) |
|
|
406 | { |
|
|
407 | once = 1; |
|
|
408 | |
|
|
409 | pthread_mutex_lock (&coro_mutex); |
|
|
410 | pthread_cond_init (&nctx.cv, 0); |
|
|
411 | null_tid = pthread_self (); |
|
|
412 | } |
|
|
413 | |
|
|
414 | pthread_cond_init (&ctx->cv, 0); |
|
|
415 | |
|
|
416 | if (coro) |
|
|
417 | { |
|
|
418 | pthread_attr_t attr; |
|
|
419 | struct coro_init_args args; |
|
|
420 | |
|
|
421 | args.func = coro; |
|
|
422 | args.arg = arg; |
|
|
423 | args.self = ctx; |
|
|
424 | args.main = &nctx; |
|
|
425 | |
|
|
426 | pthread_attr_init (&attr); |
|
|
427 | #if __UCLIBC__ |
|
|
428 | /* exists, but is borked */ |
|
|
429 | /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
201 | #else |
430 | #else |
202 | #error "linux libc or architecture not supported" |
431 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
203 | #endif |
432 | #endif |
|
|
433 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
|
|
434 | pthread_create (&ctx->id, &attr, coro_init, &args); |
204 | |
435 | |
205 | # elif CORO_IRIX |
436 | coro_transfer (args.main, args.self); |
|
|
437 | } |
|
|
438 | else |
|
|
439 | ctx->id = null_tid; |
|
|
440 | } |
206 | |
441 | |
207 | setjmp (ctx->env); |
442 | void |
208 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
443 | coro_destroy (coro_context *ctx) |
209 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize); |
444 | { |
|
|
445 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
446 | { |
|
|
447 | pthread_cancel (ctx->id); |
|
|
448 | pthread_mutex_unlock (&coro_mutex); |
|
|
449 | pthread_join (ctx->id, 0); |
|
|
450 | pthread_mutex_lock (&coro_mutex); |
|
|
451 | } |
210 | |
452 | |
211 | # endif |
453 | pthread_cond_destroy (&ctx->cv); |
212 | |
454 | } |
213 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
|
|
214 | |
455 | |
215 | #else |
456 | #else |
216 | error unsupported architecture |
457 | # error unsupported backend |
217 | #endif |
458 | #endif |
218 | } |
|
|
219 | |
459 | |