1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2001-2009 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, |
… | |
… | |
38 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
38 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
39 | */ |
39 | */ |
40 | |
40 | |
41 | #include "coro.h" |
41 | #include "coro.h" |
42 | |
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 | |
43 | #if !defined(STACK_ADJUST_PTR) |
54 | # if !defined(STACK_ADJUST_PTR) |
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55 | # if __sgi |
44 | /* IRIX is decidedly NON-unix */ |
56 | /* IRIX is decidedly NON-unix */ |
45 | # if __sgi |
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46 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
57 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
47 | # define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
58 | # define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
48 | # elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
59 | # elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
49 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
60 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
50 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
61 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
51 | # elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
62 | # elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
52 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
63 | # define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
53 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
64 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
54 | # else |
65 | # else |
55 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
66 | # define STACK_ADJUST_PTR(sp,ss) (sp) |
56 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
67 | # define STACK_ADJUST_SIZE(sp,ss) (ss) |
57 | # endif |
68 | # endif |
58 | #endif |
69 | # endif |
59 | |
70 | |
60 | #if CORO_UCONTEXT |
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61 | # include <stddef.h> |
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62 | #endif |
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63 | |
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64 | #if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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65 | |
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66 | #include <stdlib.h> |
71 | # include <stdlib.h> |
67 | |
72 | |
68 | #if CORO_SJLJ |
73 | # if CORO_SJLJ |
69 | # include <stdio.h> |
74 | # include <stdio.h> |
70 | # include <signal.h> |
75 | # include <signal.h> |
71 | # include <unistd.h> |
76 | # include <unistd.h> |
72 | #endif |
77 | # endif |
73 | |
78 | |
74 | static volatile coro_func coro_init_func; |
79 | static coro_func coro_init_func; |
75 | static volatile void *coro_init_arg; |
80 | static void *coro_init_arg; |
76 | static volatile coro_context *new_coro, *create_coro; |
81 | static coro_context *new_coro, *create_coro; |
77 | |
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78 | /* what we really want to detect here is wether we use a new-enough version of GAS */ |
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79 | /* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ |
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80 | #if __GNUC__ >= 3 && __ELF__ && __linux__ |
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81 | # define HAVE_CFI 1 |
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82 | #endif |
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83 | |
82 | |
84 | static void |
83 | static void |
85 | coro_init (void) |
84 | coro_init (void) |
86 | { |
85 | { |
87 | volatile coro_func func = coro_init_func; |
86 | volatile coro_func func = coro_init_func; |
88 | volatile void *arg = coro_init_arg; |
87 | volatile void *arg = coro_init_arg; |
89 | |
88 | |
90 | coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); |
89 | coro_transfer (new_coro, create_coro); |
91 | |
90 | |
92 | func ((void *)arg); |
91 | func ((void *)arg); |
93 | |
92 | |
94 | /* the new coro returned. bad. just abort() for now */ |
93 | /* the new coro returned. bad. just abort() for now */ |
95 | abort (); |
94 | abort (); |
96 | } |
95 | } |
97 | |
96 | |
98 | # if CORO_SJLJ |
97 | # if CORO_SJLJ |
99 | |
98 | |
100 | static volatile int trampoline_count; |
99 | static volatile int trampoline_done; |
101 | |
100 | |
102 | /* trampoline signal handler */ |
101 | /* trampoline signal handler */ |
103 | static void |
102 | static void |
104 | trampoline (int sig) |
103 | trampoline (int sig) |
105 | { |
104 | { |
106 | if (setjmp (((coro_context *)new_coro)->env)) |
105 | if (coro_setjmp (new_coro->env)) |
107 | { |
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108 | #if HAVE_CFI |
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109 | asm (".cfi_startproc"); |
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110 | #endif |
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111 | coro_init (); /* start it */ |
106 | coro_init (); /* start it */ |
112 | #if HAVE_CFI |
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113 | asm (".cfi_endproc"); |
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114 | #endif |
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115 | } |
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116 | else |
107 | else |
117 | trampoline_count++; |
108 | trampoline_done = 1; |
118 | } |
109 | } |
119 | |
110 | |
120 | # endif |
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121 | |
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122 | #endif |
111 | # endif |
123 | |
112 | |
124 | #if CORO_ASM |
113 | # if CORO_ASM |
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114 | |
125 | asm ( |
115 | asm ( |
126 | ".text\n" |
116 | ".text\n" |
127 | ".globl coro_transfer\n" |
117 | ".globl coro_transfer\n" |
128 | ".type coro_transfer, @function\n" |
118 | ".type coro_transfer, @function\n" |
129 | "coro_transfer:\n" |
119 | "coro_transfer:\n" |
130 | #if __amd64 |
120 | #if __amd64 |
131 | # define NUM_SAVED 6 |
121 | #define NUM_SAVED 6 |
132 | "\tpush %rbp\n" |
122 | "\tpush %rbp\n" |
133 | "\tpush %rbx\n" |
123 | "\tpush %rbx\n" |
134 | "\tpush %r12\n" |
124 | "\tpush %r12\n" |
135 | "\tpush %r13\n" |
125 | "\tpush %r13\n" |
136 | "\tpush %r14\n" |
126 | "\tpush %r14\n" |
137 | "\tpush %r15\n" |
127 | "\tpush %r15\n" |
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128 | #if CORO_WIN_TIB |
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129 | "\tpush %fs:0x0\n" |
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130 | "\tpush %fs:0x8\n" |
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131 | "\tpush %fs:0xc\n" |
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132 | #endif |
138 | "\tmov %rsp, (%rdi)\n" |
133 | "\tmov %rsp, (%rdi)\n" |
139 | "\tmov (%rsi), %rsp\n" |
134 | "\tmov (%rsi), %rsp\n" |
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135 | #if CORO_WIN_TIB |
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136 | "\tpop %fs:0xc\n" |
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137 | "\tpop %fs:0x8\n" |
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138 | "\tpop %fs:0x0\n" |
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139 | #endif |
140 | "\tpop %r15\n" |
140 | "\tpop %r15\n" |
141 | "\tpop %r14\n" |
141 | "\tpop %r14\n" |
142 | "\tpop %r13\n" |
142 | "\tpop %r13\n" |
143 | "\tpop %r12\n" |
143 | "\tpop %r12\n" |
144 | "\tpop %rbx\n" |
144 | "\tpop %rbx\n" |
145 | "\tpop %rbp\n" |
145 | "\tpop %rbp\n" |
146 | #elif __i386 |
146 | #elif __i386 |
147 | # define NUM_SAVED 4 |
147 | #define NUM_SAVED 4 |
148 | "\tpush %ebp\n" |
148 | "\tpush %ebp\n" |
149 | "\tpush %ebx\n" |
149 | "\tpush %ebx\n" |
150 | "\tpush %esi\n" |
150 | "\tpush %esi\n" |
151 | "\tpush %edi\n" |
151 | "\tpush %edi\n" |
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152 | #if CORO_WIN_TIB |
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153 | "\tpush %fs:0\n" |
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154 | "\tpush %fs:4\n" |
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155 | "\tpush %fs:8\n" |
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156 | #endif |
152 | "\tmov %esp, (%eax)\n" |
157 | "\tmov %esp, (%eax)\n" |
153 | "\tmov (%edx), %esp\n" |
158 | "\tmov (%edx), %esp\n" |
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159 | #if CORO_WIN_TIB |
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160 | "\tpop %fs:8\n" |
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161 | "\tpop %fs:4\n" |
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162 | "\tpop %fs:0\n" |
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163 | #endif |
154 | "\tpop %edi\n" |
164 | "\tpop %edi\n" |
155 | "\tpop %esi\n" |
165 | "\tpop %esi\n" |
156 | "\tpop %ebx\n" |
166 | "\tpop %ebx\n" |
157 | "\tpop %ebp\n" |
167 | "\tpop %ebp\n" |
158 | #else |
168 | #else |
159 | # error unsupported architecture |
169 | #error unsupported architecture |
160 | #endif |
170 | #endif |
161 | "\tret\n" |
171 | "\tret\n" |
162 | ); |
172 | ); |
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173 | |
163 | #endif |
174 | # endif |
164 | |
175 | |
165 | #if CORO_PTHREAD |
176 | void |
166 | |
177 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
167 | struct coro_init_args { |
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168 | coro_func func; |
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169 | void *arg; |
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170 | coro_context *self, *main; |
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171 | }; |
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172 | |
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173 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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174 | |
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175 | static void * |
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176 | trampoline (void *args_) |
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177 | { |
178 | { |
178 | struct coro_init_args *args = (struct coro_init_args *)args_; |
179 | coro_context nctx; |
179 | coro_func func = args->func; |
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180 | void *arg = args->arg; |
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181 | |
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182 | pthread_mutex_lock (&coro_mutex); |
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183 | pthread_cond_destroy (&args->self->c); |
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184 | coro_transfer (args->self, args->main); |
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185 | func (arg); |
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186 | pthread_mutex_unlock (&coro_mutex); |
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187 | |
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188 | return 0; |
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189 | } |
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190 | |
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191 | asm(""); |
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192 | |
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193 | void coro_transfer(coro_context *prev, coro_context *next) |
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194 | { |
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195 | pthread_cond_init (&prev->c, 0); |
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196 | pthread_cond_signal (&next->c); |
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197 | pthread_cond_wait (&prev->c, &coro_mutex); |
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198 | pthread_cond_destroy (&prev->c); |
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199 | } |
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200 | |
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201 | #endif |
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202 | |
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203 | /* initialize a machine state */ |
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204 | void coro_create (coro_context *ctx, |
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205 | coro_func coro, void *arg, |
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206 | void *sptr, long ssize) |
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207 | { |
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208 | #if CORO_UCONTEXT |
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209 | |
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210 | getcontext (&(ctx->uc)); |
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211 | |
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212 | ctx->uc.uc_link = 0; |
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213 | ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
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214 | ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize); |
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215 | ctx->uc.uc_stack.ss_flags = 0; |
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216 | |
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217 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
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218 | |
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219 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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220 | |
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221 | # if CORO_SJLJ |
180 | # if CORO_SJLJ |
222 | stack_t ostk, nstk; |
181 | stack_t ostk, nstk; |
223 | struct sigaction osa, nsa; |
182 | struct sigaction osa, nsa; |
224 | sigset_t nsig, osig; |
183 | sigset_t nsig, osig; |
225 | # endif |
184 | # endif |
226 | coro_context nctx; |
185 | |
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186 | if (!coro) |
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187 | return; |
227 | |
188 | |
228 | coro_init_func = coro; |
189 | coro_init_func = coro; |
229 | coro_init_arg = arg; |
190 | coro_init_arg = arg; |
230 | |
191 | |
231 | new_coro = ctx; |
192 | new_coro = ctx; |
… | |
… | |
257 | { |
218 | { |
258 | perror ("sigaltstack"); |
219 | perror ("sigaltstack"); |
259 | abort (); |
220 | abort (); |
260 | } |
221 | } |
261 | |
222 | |
262 | trampoline_count = 0; |
223 | trampoline_done = 0; |
263 | kill (getpid (), SIGUSR2); |
224 | kill (getpid (), SIGUSR2); |
264 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
225 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
265 | |
226 | |
266 | while (!trampoline_count) |
227 | while (!trampoline_done) |
267 | sigsuspend (&nsig); |
228 | sigsuspend (&nsig); |
268 | |
229 | |
269 | sigaltstack (0, &nstk); |
230 | sigaltstack (0, &nstk); |
270 | nstk.ss_flags = SS_DISABLE; |
231 | nstk.ss_flags = SS_DISABLE; |
271 | if (sigaltstack (&nstk, 0) < 0) |
232 | if (sigaltstack (&nstk, 0) < 0) |
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277 | |
238 | |
278 | if (~ostk.ss_flags & SS_DISABLE) |
239 | if (~ostk.ss_flags & SS_DISABLE) |
279 | sigaltstack (&ostk, 0); |
240 | sigaltstack (&ostk, 0); |
280 | |
241 | |
281 | sigaction (SIGUSR2, &osa, 0); |
242 | sigaction (SIGUSR2, &osa, 0); |
282 | |
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283 | sigprocmask (SIG_SETMASK, &osig, 0); |
243 | sigprocmask (SIG_SETMASK, &osig, 0); |
284 | |
244 | |
285 | # elif CORO_LOSER |
245 | # elif CORO_LOSER |
286 | |
246 | |
287 | setjmp (ctx->env); |
247 | coro_setjmp (ctx->env); |
288 | #if __CYGWIN__ |
248 | #if __CYGWIN__ && __i386 |
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249 | ctx->env[8] = (long) coro_init; |
289 | ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long); |
250 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
290 | ctx->env[8] = (long)coro_init; |
251 | #elif __CYGWIN__ && __x86_64 |
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252 | ctx->env[7] = (long) coro_init; |
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253 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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254 | #elif defined(__MINGW32__) |
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255 | ctx->env[5] = (long) coro_init; |
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256 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
291 | #elif defined(_M_IX86) |
257 | #elif defined(_M_IX86) |
292 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
258 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
293 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
259 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
294 | #elif defined(_M_AMD64) |
260 | #elif defined(_M_AMD64) |
295 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
261 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
296 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
262 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
297 | #elif defined(_M_IA64) |
263 | #elif defined(_M_IA64) |
298 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
264 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
299 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
265 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
300 | #else |
266 | #else |
301 | # error "microsoft libc or architecture not supported" |
267 | #error "microsoft libc or architecture not supported" |
302 | #endif |
268 | #endif |
303 | |
269 | |
304 | # elif CORO_LINUX |
270 | # elif CORO_LINUX |
305 | |
271 | |
306 | _setjmp (ctx->env); |
272 | coro_setjmp (ctx->env); |
307 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
273 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
308 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
274 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
309 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
275 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
310 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
276 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
311 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
277 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
312 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long); |
278 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
313 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
279 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
314 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
280 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
315 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
281 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
316 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
282 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
317 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
283 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
318 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
284 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
319 | #else |
285 | #else |
320 | # error "linux libc or architecture not supported" |
286 | #error "linux libc or architecture not supported" |
321 | #endif |
287 | #endif |
322 | |
288 | |
323 | # elif CORO_IRIX |
289 | # elif CORO_IRIX |
324 | |
290 | |
325 | setjmp (ctx->env); |
291 | coro_setjmp (ctx->env, 0); |
326 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
292 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
327 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
293 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
328 | |
294 | |
329 | # elif CORO_ASM |
295 | # elif CORO_ASM |
330 | |
296 | |
331 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
297 | ctx->sp = (void **)(ssize + (char *)sptr); |
332 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
298 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
333 | *--ctx->sp = (void *)coro_init; |
299 | *--ctx->sp = (void *)coro_init; |
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300 | |
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301 | #if CORO_WIN_TIB |
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302 | *--ctx->sp = 0; /* ExceptionList */ |
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303 | *--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
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304 | *--ctx->sp = sptr; /* StackLimit */ |
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305 | #endif |
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306 | |
334 | ctx->sp -= NUM_SAVED; |
307 | ctx->sp -= NUM_SAVED; |
335 | |
308 | |
336 | # endif |
309 | # elif CORO_UCONTEXT |
337 | |
310 | |
338 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
311 | getcontext (&(ctx->uc)); |
339 | |
312 | |
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313 | ctx->uc.uc_link = 0; |
|
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314 | ctx->uc.uc_stack.ss_sp = sptr; |
|
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315 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
|
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316 | ctx->uc.uc_stack.ss_flags = 0; |
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317 | |
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318 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
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319 | |
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320 | # endif |
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321 | |
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322 | coro_transfer (create_coro, new_coro); |
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323 | } |
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324 | |
|
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325 | /*****************************************************************************/ |
|
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326 | /* pthread backend */ |
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327 | /*****************************************************************************/ |
340 | # elif CORO_PTHREAD |
328 | #elif CORO_PTHREAD |
341 | |
329 | |
342 | pthread_t id; |
330 | /* this mutex will be locked by the running coroutine */ |
343 | pthread_attr_t attr; |
331 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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332 | |
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333 | struct coro_init_args |
|
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334 | { |
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335 | coro_func func; |
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336 | void *arg; |
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337 | coro_context *self, *main; |
|
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338 | }; |
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339 | |
|
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340 | static pthread_t null_tid; |
|
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341 | |
|
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342 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
|
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343 | static void |
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344 | mutex_unlock_wrapper (void *arg) |
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345 | { |
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346 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
|
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347 | } |
|
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348 | |
|
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349 | static void * |
|
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350 | coro_init (void *args_) |
|
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351 | { |
|
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352 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
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353 | coro_func func = args->func; |
|
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354 | void *arg = args->arg; |
|
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355 | |
|
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356 | pthread_mutex_lock (&coro_mutex); |
|
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357 | |
|
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358 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
|
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359 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
|
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360 | coro_transfer (args->self, args->main); |
|
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361 | func (arg); |
|
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362 | pthread_cleanup_pop (1); |
|
|
363 | |
|
|
364 | return 0; |
|
|
365 | } |
|
|
366 | |
|
|
367 | void |
|
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368 | coro_transfer (coro_context *prev, coro_context *next) |
|
|
369 | { |
|
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370 | pthread_cond_signal (&next->cv); |
|
|
371 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
|
372 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
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373 | pthread_testcancel (); |
|
|
374 | #endif |
|
|
375 | } |
|
|
376 | |
|
|
377 | void |
|
|
378 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
|
|
379 | { |
344 | coro_context nctx; |
380 | static coro_context nctx; |
345 | struct coro_init_args args; |
|
|
346 | static int once; |
381 | static int once; |
347 | |
382 | |
348 | if (!once) |
383 | if (!once) |
349 | { |
384 | { |
|
|
385 | once = 1; |
|
|
386 | |
350 | pthread_mutex_lock (&coro_mutex); |
387 | pthread_mutex_lock (&coro_mutex); |
351 | once = 1; |
388 | pthread_cond_init (&nctx.cv, 0); |
|
|
389 | null_tid = pthread_self (); |
352 | } |
390 | } |
353 | |
391 | |
|
|
392 | pthread_cond_init (&ctx->cv, 0); |
|
|
393 | |
|
|
394 | if (coro) |
|
|
395 | { |
|
|
396 | pthread_attr_t attr; |
|
|
397 | struct coro_init_args args; |
|
|
398 | |
354 | args.func = coro; |
399 | args.func = coro; |
355 | args.arg = arg; |
400 | args.arg = arg; |
356 | args.self = ctx; |
401 | args.self = ctx; |
357 | args.main = &nctx; |
402 | args.main = &nctx; |
358 | |
403 | |
359 | pthread_attr_init (&attr); |
404 | pthread_attr_init (&attr); |
360 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
|
|
361 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
405 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
|
|
406 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
362 | pthread_create (&id, &attr, trampoline, &args); |
407 | pthread_create (&ctx->id, &attr, coro_init, &args); |
363 | |
408 | |
364 | pthread_cond_init (&args.self->c, 0); |
|
|
365 | coro_transfer (args.main, args.self); |
409 | coro_transfer (args.main, args.self); |
|
|
410 | } |
|
|
411 | else |
|
|
412 | ctx->id = null_tid; |
|
|
413 | } |
|
|
414 | |
|
|
415 | void |
|
|
416 | coro_destroy (coro_context *ctx) |
|
|
417 | { |
|
|
418 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
419 | { |
|
|
420 | pthread_cancel (ctx->id); |
|
|
421 | pthread_mutex_unlock (&coro_mutex); |
|
|
422 | pthread_join (ctx->id, 0); |
|
|
423 | pthread_mutex_lock (&coro_mutex); |
|
|
424 | } |
|
|
425 | |
|
|
426 | pthread_cond_destroy (&ctx->cv); |
|
|
427 | } |
366 | |
428 | |
367 | #else |
429 | #else |
368 | # error unsupported backend |
430 | # error unsupported backend |
369 | #endif |
431 | #endif |
370 | } |
|
|
371 | |
432 | |