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" |
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120 | /* windows, of course, gives a shit on the amd64 ABI and uses different registers */ |
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121 | /* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */ |
130 | #if __amd64 |
122 | #if __amd64 |
131 | # define NUM_SAVED 6 |
123 | #define NUM_SAVED 6 |
132 | "\tpush %rbp\n" |
124 | "\tpush %rbp\n" |
133 | "\tpush %rbx\n" |
125 | "\tpush %rbx\n" |
134 | "\tpush %r12\n" |
126 | "\tpush %r12\n" |
135 | "\tpush %r13\n" |
127 | "\tpush %r13\n" |
136 | "\tpush %r14\n" |
128 | "\tpush %r14\n" |
137 | "\tpush %r15\n" |
129 | "\tpush %r15\n" |
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130 | #if CORO_WIN_TIB |
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131 | "\tpush %gs:0x0\n" |
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132 | "\tpush %gs:0x8\n" |
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133 | "\tpush %gs:0xc\n" |
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134 | #endif |
138 | "\tmov %rsp, (%rdi)\n" |
135 | "\tmov %rsp, (%rdi)\n" |
139 | "\tmov (%rsi), %rsp\n" |
136 | "\tmov (%rsi), %rsp\n" |
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137 | #if CORO_WIN_TIB |
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138 | "\tpop %gs:0xc\n" |
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139 | "\tpop %gs:0x8\n" |
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140 | "\tpop %gs:0x0\n" |
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141 | #endif |
140 | "\tpop %r15\n" |
142 | "\tpop %r15\n" |
141 | "\tpop %r14\n" |
143 | "\tpop %r14\n" |
142 | "\tpop %r13\n" |
144 | "\tpop %r13\n" |
143 | "\tpop %r12\n" |
145 | "\tpop %r12\n" |
144 | "\tpop %rbx\n" |
146 | "\tpop %rbx\n" |
145 | "\tpop %rbp\n" |
147 | "\tpop %rbp\n" |
146 | #elif __i386 |
148 | #elif __i386 |
147 | # define NUM_SAVED 4 |
149 | #define NUM_SAVED 4 |
148 | "\tpush %ebp\n" |
150 | "\tpush %ebp\n" |
149 | "\tpush %ebx\n" |
151 | "\tpush %ebx\n" |
150 | "\tpush %esi\n" |
152 | "\tpush %esi\n" |
151 | "\tpush %edi\n" |
153 | "\tpush %edi\n" |
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154 | #if CORO_WIN_TIB |
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155 | "\tpush %fs:0\n" |
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156 | "\tpush %fs:4\n" |
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157 | "\tpush %fs:8\n" |
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158 | #endif |
152 | "\tmov %esp, (%eax)\n" |
159 | "\tmov %esp, (%eax)\n" |
153 | "\tmov (%edx), %esp\n" |
160 | "\tmov (%edx), %esp\n" |
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161 | #if CORO_WIN_TIB |
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162 | "\tpop %fs:8\n" |
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163 | "\tpop %fs:4\n" |
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164 | "\tpop %fs:0\n" |
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165 | #endif |
154 | "\tpop %edi\n" |
166 | "\tpop %edi\n" |
155 | "\tpop %esi\n" |
167 | "\tpop %esi\n" |
156 | "\tpop %ebx\n" |
168 | "\tpop %ebx\n" |
157 | "\tpop %ebp\n" |
169 | "\tpop %ebp\n" |
158 | #else |
170 | #else |
159 | # error unsupported architecture |
171 | #error unsupported architecture |
160 | #endif |
172 | #endif |
161 | "\tret\n" |
173 | "\tret\n" |
162 | ); |
174 | ); |
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175 | |
163 | #endif |
176 | # endif |
164 | |
177 | |
165 | #if CORO_PTHREAD |
178 | void |
166 | |
179 | 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 | { |
180 | { |
178 | struct coro_init_args *args = (struct coro_init_args *)args_; |
181 | 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 |
182 | # if CORO_SJLJ |
222 | stack_t ostk, nstk; |
183 | stack_t ostk, nstk; |
223 | struct sigaction osa, nsa; |
184 | struct sigaction osa, nsa; |
224 | sigset_t nsig, osig; |
185 | sigset_t nsig, osig; |
225 | # endif |
186 | # endif |
226 | coro_context nctx; |
187 | |
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188 | if (!coro) |
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189 | return; |
227 | |
190 | |
228 | coro_init_func = coro; |
191 | coro_init_func = coro; |
229 | coro_init_arg = arg; |
192 | coro_init_arg = arg; |
230 | |
193 | |
231 | new_coro = ctx; |
194 | new_coro = ctx; |
… | |
… | |
247 | perror ("sigaction"); |
210 | perror ("sigaction"); |
248 | abort (); |
211 | abort (); |
249 | } |
212 | } |
250 | |
213 | |
251 | /* set the new stack */ |
214 | /* set the new stack */ |
252 | nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
215 | nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
253 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
216 | nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
254 | nstk.ss_flags = 0; |
217 | nstk.ss_flags = 0; |
255 | |
218 | |
256 | if (sigaltstack (&nstk, &ostk) < 0) |
219 | if (sigaltstack (&nstk, &ostk) < 0) |
257 | { |
220 | { |
258 | perror ("sigaltstack"); |
221 | perror ("sigaltstack"); |
259 | abort (); |
222 | abort (); |
260 | } |
223 | } |
261 | |
224 | |
262 | trampoline_count = 0; |
225 | trampoline_done = 0; |
263 | kill (getpid (), SIGUSR2); |
226 | kill (getpid (), SIGUSR2); |
264 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
227 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
265 | |
228 | |
266 | while (!trampoline_count) |
229 | while (!trampoline_done) |
267 | sigsuspend (&nsig); |
230 | sigsuspend (&nsig); |
268 | |
231 | |
269 | sigaltstack (0, &nstk); |
232 | sigaltstack (0, &nstk); |
270 | nstk.ss_flags = SS_DISABLE; |
233 | nstk.ss_flags = SS_DISABLE; |
271 | if (sigaltstack (&nstk, 0) < 0) |
234 | if (sigaltstack (&nstk, 0) < 0) |
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277 | |
240 | |
278 | if (~ostk.ss_flags & SS_DISABLE) |
241 | if (~ostk.ss_flags & SS_DISABLE) |
279 | sigaltstack (&ostk, 0); |
242 | sigaltstack (&ostk, 0); |
280 | |
243 | |
281 | sigaction (SIGUSR2, &osa, 0); |
244 | sigaction (SIGUSR2, &osa, 0); |
282 | |
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283 | sigprocmask (SIG_SETMASK, &osig, 0); |
245 | sigprocmask (SIG_SETMASK, &osig, 0); |
284 | |
246 | |
285 | # elif CORO_LOSER |
247 | # elif CORO_LOSER |
286 | |
248 | |
287 | setjmp (ctx->env); |
249 | coro_setjmp (ctx->env); |
288 | #if __CYGWIN__ |
250 | #if __CYGWIN__ && __i386 |
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251 | ctx->env[8] = (long) coro_init; |
289 | ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long); |
252 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
290 | ctx->env[8] = (long)coro_init; |
253 | #elif __CYGWIN__ && __x86_64 |
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254 | ctx->env[7] = (long) coro_init; |
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255 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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256 | #elif defined(__MINGW32__) |
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257 | ctx->env[5] = (long) coro_init; |
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258 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
291 | #elif defined(_M_IX86) |
259 | #elif defined(_M_IX86) |
292 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
260 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
293 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
261 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
294 | #elif defined(_M_AMD64) |
262 | #elif defined(_M_AMD64) |
295 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
263 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
296 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
264 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
297 | #elif defined(_M_IA64) |
265 | #elif defined(_M_IA64) |
298 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
266 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
299 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
267 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
300 | #else |
268 | #else |
301 | # error "microsoft libc or architecture not supported" |
269 | #error "microsoft libc or architecture not supported" |
302 | #endif |
270 | #endif |
303 | |
271 | |
304 | # elif CORO_LINUX |
272 | # elif CORO_LINUX |
305 | |
273 | |
306 | _setjmp (ctx->env); |
274 | coro_setjmp (ctx->env); |
307 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
275 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
308 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
276 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
309 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
277 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
310 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
278 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
311 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
279 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
312 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long); |
280 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
313 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
281 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
314 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
282 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
315 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
283 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
316 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
284 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
317 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
285 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
318 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
286 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
319 | #else |
287 | #else |
320 | # error "linux libc or architecture not supported" |
288 | #error "linux libc or architecture not supported" |
321 | #endif |
289 | #endif |
322 | |
290 | |
323 | # elif CORO_IRIX |
291 | # elif CORO_IRIX |
324 | |
292 | |
325 | setjmp (ctx->env); |
293 | coro_setjmp (ctx->env, 0); |
326 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
294 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
327 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
295 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
328 | |
296 | |
329 | # elif CORO_ASM |
297 | # elif CORO_ASM |
330 | |
298 | |
331 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
299 | ctx->sp = (void **)(ssize + (char *)sptr); |
332 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
300 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
333 | *--ctx->sp = (void *)coro_init; |
301 | *--ctx->sp = (void *)coro_init; |
|
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302 | |
|
|
303 | #if CORO_WIN_TIB |
|
|
304 | *--ctx->sp = 0; /* ExceptionList */ |
|
|
305 | *--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
|
|
306 | *--ctx->sp = sptr; /* StackLimit */ |
|
|
307 | #endif |
|
|
308 | |
334 | ctx->sp -= NUM_SAVED; |
309 | ctx->sp -= NUM_SAVED; |
335 | |
310 | |
336 | # endif |
311 | # elif CORO_UCONTEXT |
337 | |
312 | |
338 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
313 | getcontext (&(ctx->uc)); |
339 | |
314 | |
|
|
315 | ctx->uc.uc_link = 0; |
|
|
316 | ctx->uc.uc_stack.ss_sp = sptr; |
|
|
317 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
|
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318 | ctx->uc.uc_stack.ss_flags = 0; |
|
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319 | |
|
|
320 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
|
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321 | |
|
|
322 | # endif |
|
|
323 | |
|
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324 | coro_transfer (create_coro, new_coro); |
|
|
325 | } |
|
|
326 | |
|
|
327 | /*****************************************************************************/ |
|
|
328 | /* pthread backend */ |
|
|
329 | /*****************************************************************************/ |
340 | # elif CORO_PTHREAD |
330 | #elif CORO_PTHREAD |
341 | |
331 | |
342 | pthread_t id; |
332 | /* this mutex will be locked by the running coroutine */ |
343 | pthread_attr_t attr; |
333 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
|
|
334 | |
|
|
335 | struct coro_init_args |
|
|
336 | { |
|
|
337 | coro_func func; |
|
|
338 | void *arg; |
|
|
339 | coro_context *self, *main; |
|
|
340 | }; |
|
|
341 | |
|
|
342 | static pthread_t null_tid; |
|
|
343 | |
|
|
344 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
|
|
345 | static void |
|
|
346 | mutex_unlock_wrapper (void *arg) |
|
|
347 | { |
|
|
348 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
|
|
349 | } |
|
|
350 | |
|
|
351 | static void * |
|
|
352 | coro_init (void *args_) |
|
|
353 | { |
|
|
354 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
|
355 | coro_func func = args->func; |
|
|
356 | void *arg = args->arg; |
|
|
357 | |
|
|
358 | pthread_mutex_lock (&coro_mutex); |
|
|
359 | |
|
|
360 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
|
|
361 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
|
|
362 | coro_transfer (args->self, args->main); |
|
|
363 | func (arg); |
|
|
364 | pthread_cleanup_pop (1); |
|
|
365 | |
|
|
366 | return 0; |
|
|
367 | } |
|
|
368 | |
|
|
369 | void |
|
|
370 | coro_transfer (coro_context *prev, coro_context *next) |
|
|
371 | { |
|
|
372 | pthread_cond_signal (&next->cv); |
|
|
373 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
|
374 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
|
375 | pthread_testcancel (); |
|
|
376 | #endif |
|
|
377 | } |
|
|
378 | |
|
|
379 | void |
|
|
380 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
|
|
381 | { |
344 | coro_context nctx; |
382 | static coro_context nctx; |
345 | struct coro_init_args args; |
|
|
346 | static int once; |
383 | static int once; |
347 | |
384 | |
348 | if (!once) |
385 | if (!once) |
349 | { |
386 | { |
|
|
387 | once = 1; |
|
|
388 | |
350 | pthread_mutex_lock (&coro_mutex); |
389 | pthread_mutex_lock (&coro_mutex); |
351 | once = 1; |
390 | pthread_cond_init (&nctx.cv, 0); |
|
|
391 | null_tid = pthread_self (); |
352 | } |
392 | } |
353 | |
393 | |
|
|
394 | pthread_cond_init (&ctx->cv, 0); |
|
|
395 | |
|
|
396 | if (coro) |
|
|
397 | { |
|
|
398 | pthread_attr_t attr; |
|
|
399 | struct coro_init_args args; |
|
|
400 | |
354 | args.func = coro; |
401 | args.func = coro; |
355 | args.arg = arg; |
402 | args.arg = arg; |
356 | args.self = ctx; |
403 | args.self = ctx; |
357 | args.main = &nctx; |
404 | args.main = &nctx; |
358 | |
405 | |
359 | pthread_attr_init (&attr); |
406 | pthread_attr_init (&attr); |
360 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
407 | #if __UCLIBC__ |
|
|
408 | /* exists, but is borked */ |
|
|
409 | /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
|
|
410 | #else |
361 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
411 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
|
|
412 | #endif |
|
|
413 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
362 | pthread_create (&id, &attr, trampoline, &args); |
414 | pthread_create (&ctx->id, &attr, coro_init, &args); |
363 | |
415 | |
364 | pthread_cond_init (&args.self->c, 0); |
|
|
365 | coro_transfer (args.main, args.self); |
416 | coro_transfer (args.main, args.self); |
|
|
417 | } |
|
|
418 | else |
|
|
419 | ctx->id = null_tid; |
|
|
420 | } |
|
|
421 | |
|
|
422 | void |
|
|
423 | coro_destroy (coro_context *ctx) |
|
|
424 | { |
|
|
425 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
426 | { |
|
|
427 | pthread_cancel (ctx->id); |
|
|
428 | pthread_mutex_unlock (&coro_mutex); |
|
|
429 | pthread_join (ctx->id, 0); |
|
|
430 | pthread_mutex_lock (&coro_mutex); |
|
|
431 | } |
|
|
432 | |
|
|
433 | pthread_cond_destroy (&ctx->cv); |
|
|
434 | } |
366 | |
435 | |
367 | #else |
436 | #else |
368 | # error unsupported backend |
437 | # error unsupported backend |
369 | #endif |
438 | #endif |
370 | } |
|
|
371 | |
439 | |