1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2008 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, |
… | |
… | |
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); |
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90 | |
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91 | #if __GCC_HAVE_DWARF2_CFI_ASM && __amd64 |
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92 | asm (".cfi_undefined rip"); |
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93 | #endif |
91 | |
94 | |
92 | func ((void *)arg); |
95 | func ((void *)arg); |
93 | |
96 | |
94 | /* the new coro returned. bad. just abort() for now */ |
97 | /* the new coro returned. bad. just abort() for now */ |
95 | abort (); |
98 | abort (); |
96 | } |
99 | } |
97 | |
100 | |
98 | # if CORO_SJLJ |
101 | # if CORO_SJLJ |
99 | |
102 | |
100 | static volatile int trampoline_count; |
103 | static volatile int trampoline_done; |
101 | |
104 | |
102 | /* trampoline signal handler */ |
105 | /* trampoline signal handler */ |
103 | static void |
106 | static void |
104 | trampoline (int sig) |
107 | trampoline (int sig) |
105 | { |
108 | { |
106 | if (setjmp (((coro_context *)new_coro)->env)) |
109 | 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 */ |
110 | 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 |
111 | else |
117 | trampoline_count++; |
112 | trampoline_done = 1; |
118 | } |
113 | } |
119 | |
114 | |
120 | # endif |
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121 | |
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122 | #endif |
115 | # endif |
123 | |
116 | |
124 | #if CORO_ASM |
117 | # if CORO_ASM |
125 | void __attribute__((__noinline__, __regparm__(2))) |
118 | |
126 | coro_transfer (struct coro_context *prev, struct coro_context *next) |
119 | #if _WIN32 |
127 | { |
120 | #define CORO_WIN_TIB 1 |
128 | asm volatile ( |
121 | #endif |
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122 | |
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123 | asm ( |
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124 | "\t.text\n" |
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125 | "\t.globl coro_transfer\n" |
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126 | "coro_transfer:\n" |
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127 | /* windows, of course, gives a shit on the amd64 ABI and uses different registers */ |
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128 | /* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */ |
129 | #if __amd64 |
129 | #if __amd64 |
130 | # define NUM_SAVED 5 |
130 | #ifdef WIN32 |
131 | "push %%rbx\n\t" |
131 | /* TODO: xmm6..15 also would need to be saved. sigh. */ |
132 | "push %%r12\n\t" |
132 | #define NUM_SAVED 8 |
133 | "push %%r13\n\t" |
133 | "\tpushq %rsi\n" |
134 | "push %%r14\n\t" |
134 | "\tpushq %rdi\n" |
135 | "push %%r15\n\t" |
135 | "\tpushq %rbp\n" |
136 | "mov %%rsp, %0\n\t" |
136 | "\tpushq %rbx\n" |
137 | "mov %1, %%rsp\n\t" |
137 | "\tpushq %r12\n" |
138 | "pop %%r15\n\t" |
138 | "\tpushq %r13\n" |
139 | "pop %%r14\n\t" |
139 | "\tpushq %r14\n" |
140 | "pop %%r13\n\t" |
140 | "\tpushq %r15\n" |
141 | "pop %%r12\n\t" |
141 | #if CORO_WIN_TIB |
142 | "pop %%rbx\n\t" |
142 | "\tpushq %fs:0x0\n" |
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143 | "\tpushq %fs:0x8\n" |
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144 | "\tpushq %fs:0xc\n" |
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145 | #endif |
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146 | "\tmovq %rsp, (%rcx)\n" |
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147 | "\tmovq (%rdx), %rsp\n" |
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148 | #if CORO_WIN_TIB |
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149 | "\tpopq %fs:0xc\n" |
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150 | "\tpopq %fs:0x8\n" |
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151 | "\tpopq %fs:0x0\n" |
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152 | #endif |
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153 | "\tpopq %r15\n" |
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154 | "\tpopq %r14\n" |
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155 | "\tpopq %r13\n" |
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156 | "\tpopq %r12\n" |
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157 | "\tpopq %rbx\n" |
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158 | "\tpopq %rbp\n" |
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159 | "\tpopq %rdi\n" |
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160 | "\tpopq %rsi\n" |
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161 | #else |
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162 | #define NUM_SAVED 6 |
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163 | "\tpushq %rbp\n" |
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164 | "\tpushq %rbx\n" |
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165 | "\tpushq %r12\n" |
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166 | "\tpushq %r13\n" |
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167 | "\tpushq %r14\n" |
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168 | "\tpushq %r15\n" |
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169 | "\tmovq %rsp, (%rdi)\n" |
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170 | "\tmovq (%rsi), %rsp\n" |
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171 | "\tpopq %r15\n" |
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172 | "\tpopq %r14\n" |
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173 | "\tpopq %r13\n" |
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174 | "\tpopq %r12\n" |
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175 | "\tpopq %rbx\n" |
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176 | "\tpopq %rbp\n" |
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177 | #endif |
143 | #elif __i386 |
178 | #elif __i386 |
144 | # define NUM_SAVED 4 |
179 | #define NUM_SAVED 4 |
145 | "push %%ebx\n\t" |
180 | "\tpushl %ebp\n" |
146 | "push %%esi\n\t" |
181 | "\tpushl %ebx\n" |
147 | "push %%edi\n\t" |
182 | "\tpushl %esi\n" |
148 | "push %%ebp\n\t" |
183 | "\tpushl %edi\n" |
149 | "mov %%esp, %0\n\t" |
184 | #if CORO_WIN_TIB |
150 | "mov %1, %%esp\n\t" |
185 | "\tpushl %fs:0\n" |
151 | "pop %%ebp\n\t" |
186 | "\tpushl %fs:4\n" |
152 | "pop %%edi\n\t" |
187 | "\tpushl %fs:8\n" |
153 | "pop %%esi\n\t" |
188 | #endif |
154 | "pop %%ebx\n\t" |
189 | "\tmovl %esp, (%eax)\n" |
155 | #else |
190 | "\tmovl (%edx), %esp\n" |
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191 | #if CORO_WIN_TIB |
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192 | "\tpopl %fs:8\n" |
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193 | "\tpopl %fs:4\n" |
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194 | "\tpopl %fs:0\n" |
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195 | #endif |
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196 | "\tpopl %edi\n" |
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197 | "\tpopl %esi\n" |
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198 | "\tpopl %ebx\n" |
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199 | "\tpopl %ebp\n" |
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200 | #else |
156 | # error unsupported architecture |
201 | #error unsupported architecture |
157 | #endif |
202 | #endif |
158 | : "=m" (prev->sp) |
203 | "\tret\n" |
159 | : "m" (next->sp) |
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160 | ); |
204 | ); |
161 | } |
205 | |
162 | #endif |
206 | # endif |
163 | |
207 | |
164 | #if CORO_PTHREAD |
208 | void |
165 | |
209 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
166 | struct coro_init_args { |
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167 | coro_func func; |
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168 | void *arg; |
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169 | coro_context *self, *main; |
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170 | }; |
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171 | |
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172 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
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173 | |
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174 | static void * |
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175 | trampoline (void *args_) |
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176 | { |
210 | { |
177 | struct coro_init_args *args = (struct coro_init_args *)args_; |
211 | coro_context nctx; |
178 | coro_func func = args->func; |
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179 | void *arg = args->arg; |
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180 | |
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181 | pthread_mutex_lock (&coro_mutex); |
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182 | pthread_cond_destroy (&args->self->c); |
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183 | coro_transfer (args->self, args->main); |
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184 | func (arg); |
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185 | pthread_mutex_unlock (&coro_mutex); |
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186 | |
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187 | return 0; |
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188 | } |
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189 | |
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190 | void coro_transfer(coro_context *prev, coro_context *next) |
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191 | { |
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192 | pthread_cond_init (&prev->c, 0); |
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193 | pthread_cond_signal (&next->c); |
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194 | pthread_cond_wait (&prev->c, &coro_mutex); |
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195 | pthread_cond_destroy (&prev->c); |
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196 | } |
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197 | |
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198 | #endif |
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199 | |
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200 | /* initialize a machine state */ |
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201 | void coro_create (coro_context *ctx, |
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202 | coro_func coro, void *arg, |
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203 | void *sptr, long ssize) |
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204 | { |
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205 | #if CORO_UCONTEXT |
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206 | |
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207 | getcontext (&(ctx->uc)); |
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208 | |
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209 | ctx->uc.uc_link = 0; |
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210 | ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
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211 | ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); |
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212 | ctx->uc.uc_stack.ss_flags = 0; |
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213 | |
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214 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
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215 | |
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216 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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217 | |
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218 | # if CORO_SJLJ |
212 | # if CORO_SJLJ |
219 | stack_t ostk, nstk; |
213 | stack_t ostk, nstk; |
220 | struct sigaction osa, nsa; |
214 | struct sigaction osa, nsa; |
221 | sigset_t nsig, osig; |
215 | sigset_t nsig, osig; |
222 | # endif |
216 | # endif |
223 | coro_context nctx; |
217 | |
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218 | if (!coro) |
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219 | return; |
224 | |
220 | |
225 | coro_init_func = coro; |
221 | coro_init_func = coro; |
226 | coro_init_arg = arg; |
222 | coro_init_arg = arg; |
227 | |
223 | |
228 | new_coro = ctx; |
224 | new_coro = ctx; |
… | |
… | |
244 | perror ("sigaction"); |
240 | perror ("sigaction"); |
245 | abort (); |
241 | abort (); |
246 | } |
242 | } |
247 | |
243 | |
248 | /* set the new stack */ |
244 | /* set the new stack */ |
249 | nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
245 | nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
250 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
246 | nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
251 | nstk.ss_flags = 0; |
247 | nstk.ss_flags = 0; |
252 | |
248 | |
253 | if (sigaltstack (&nstk, &ostk) < 0) |
249 | if (sigaltstack (&nstk, &ostk) < 0) |
254 | { |
250 | { |
255 | perror ("sigaltstack"); |
251 | perror ("sigaltstack"); |
256 | abort (); |
252 | abort (); |
257 | } |
253 | } |
258 | |
254 | |
259 | trampoline_count = 0; |
255 | trampoline_done = 0; |
260 | kill (getpid (), SIGUSR2); |
256 | kill (getpid (), SIGUSR2); |
261 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
257 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
262 | |
258 | |
263 | while (!trampoline_count) |
259 | while (!trampoline_done) |
264 | sigsuspend (&nsig); |
260 | sigsuspend (&nsig); |
265 | |
261 | |
266 | sigaltstack (0, &nstk); |
262 | sigaltstack (0, &nstk); |
267 | nstk.ss_flags = SS_DISABLE; |
263 | nstk.ss_flags = SS_DISABLE; |
268 | if (sigaltstack (&nstk, 0) < 0) |
264 | if (sigaltstack (&nstk, 0) < 0) |
… | |
… | |
274 | |
270 | |
275 | if (~ostk.ss_flags & SS_DISABLE) |
271 | if (~ostk.ss_flags & SS_DISABLE) |
276 | sigaltstack (&ostk, 0); |
272 | sigaltstack (&ostk, 0); |
277 | |
273 | |
278 | sigaction (SIGUSR2, &osa, 0); |
274 | sigaction (SIGUSR2, &osa, 0); |
279 | |
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280 | sigprocmask (SIG_SETMASK, &osig, 0); |
275 | sigprocmask (SIG_SETMASK, &osig, 0); |
281 | |
276 | |
282 | # elif CORO_LOSER |
277 | # elif CORO_LOSER |
283 | |
278 | |
284 | setjmp (ctx->env); |
279 | coro_setjmp (ctx->env); |
285 | #if __CYGWIN__ |
280 | #if __CYGWIN__ && __i386 |
286 | ctx->env[7] = (long)((char *)sptr + ssize); |
281 | ctx->env[8] = (long) coro_init; |
287 | ctx->env[8] = (long)coro_init; |
282 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
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283 | #elif __CYGWIN__ && __x86_64 |
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284 | ctx->env[7] = (long) coro_init; |
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285 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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286 | #elif defined(__MINGW32__) |
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287 | ctx->env[5] = (long) coro_init; |
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288 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
288 | #elif defined(_M_IX86) |
289 | #elif defined(_M_IX86) |
289 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
290 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
290 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize); |
291 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
291 | #elif defined(_M_AMD64) |
292 | #elif defined(_M_AMD64) |
292 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
293 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
293 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize); |
294 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
294 | #elif defined(_M_IA64) |
295 | #elif defined(_M_IA64) |
295 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
296 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
296 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize); |
297 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
297 | #else |
298 | #else |
298 | # error "microsoft libc or architecture not supported" |
299 | #error "microsoft libc or architecture not supported" |
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300 | #endif |
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301 | |
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302 | # elif CORO_LINUX |
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303 | |
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304 | coro_setjmp (ctx->env); |
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305 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
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306 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
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307 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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308 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
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309 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
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310 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
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311 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
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312 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
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|
313 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
|
|
314 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
|
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315 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
|
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316 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
|
|
317 | #else |
|
|
318 | #error "linux libc or architecture not supported" |
|
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319 | #endif |
|
|
320 | |
|
|
321 | # elif CORO_IRIX |
|
|
322 | |
|
|
323 | coro_setjmp (ctx->env, 0); |
|
|
324 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
|
|
325 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
|
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326 | |
|
|
327 | # elif CORO_ASM |
|
|
328 | |
|
|
329 | ctx->sp = (void **)(ssize + (char *)sptr); |
|
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330 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
|
|
331 | *--ctx->sp = (void *)coro_init; |
|
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332 | |
|
|
333 | #if CORO_WIN_TIB |
|
|
334 | *--ctx->sp = 0; /* ExceptionList */ |
|
|
335 | *--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
|
|
336 | *--ctx->sp = sptr; /* StackLimit */ |
|
|
337 | #endif |
|
|
338 | |
|
|
339 | ctx->sp -= NUM_SAVED; |
|
|
340 | memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
|
|
341 | |
|
|
342 | # elif CORO_UCONTEXT |
|
|
343 | |
|
|
344 | getcontext (&(ctx->uc)); |
|
|
345 | |
|
|
346 | ctx->uc.uc_link = 0; |
|
|
347 | ctx->uc.uc_stack.ss_sp = sptr; |
|
|
348 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
|
|
349 | ctx->uc.uc_stack.ss_flags = 0; |
|
|
350 | |
|
|
351 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
|
|
352 | |
|
|
353 | # endif |
|
|
354 | |
|
|
355 | coro_transfer (create_coro, new_coro); |
|
|
356 | } |
|
|
357 | |
|
|
358 | /*****************************************************************************/ |
|
|
359 | /* pthread backend */ |
|
|
360 | /*****************************************************************************/ |
|
|
361 | #elif CORO_PTHREAD |
|
|
362 | |
|
|
363 | /* this mutex will be locked by the running coroutine */ |
|
|
364 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
|
|
365 | |
|
|
366 | struct coro_init_args |
|
|
367 | { |
|
|
368 | coro_func func; |
|
|
369 | void *arg; |
|
|
370 | coro_context *self, *main; |
|
|
371 | }; |
|
|
372 | |
|
|
373 | static pthread_t null_tid; |
|
|
374 | |
|
|
375 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
|
|
376 | static void |
|
|
377 | mutex_unlock_wrapper (void *arg) |
|
|
378 | { |
|
|
379 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
|
|
380 | } |
|
|
381 | |
|
|
382 | static void * |
|
|
383 | coro_init (void *args_) |
|
|
384 | { |
|
|
385 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
|
386 | coro_func func = args->func; |
|
|
387 | void *arg = args->arg; |
|
|
388 | |
|
|
389 | pthread_mutex_lock (&coro_mutex); |
|
|
390 | |
|
|
391 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
|
|
392 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
|
|
393 | coro_transfer (args->self, args->main); |
|
|
394 | func (arg); |
|
|
395 | pthread_cleanup_pop (1); |
|
|
396 | |
|
|
397 | return 0; |
|
|
398 | } |
|
|
399 | |
|
|
400 | void |
|
|
401 | coro_transfer (coro_context *prev, coro_context *next) |
|
|
402 | { |
|
|
403 | pthread_cond_signal (&next->cv); |
|
|
404 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
|
405 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
|
406 | pthread_testcancel (); |
299 | #endif |
407 | #endif |
|
|
408 | } |
300 | |
409 | |
301 | # elif CORO_LINUX |
410 | void |
302 | |
411 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
303 | _setjmp (ctx->env); |
412 | { |
304 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
|
|
305 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
|
|
306 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
|
|
307 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
|
|
308 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
|
|
309 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
|
|
310 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
|
|
311 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
|
|
312 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
|
|
313 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
|
|
314 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
|
|
315 | ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
|
|
316 | #else |
|
|
317 | # error "linux libc or architecture not supported" |
|
|
318 | #endif |
|
|
319 | |
|
|
320 | # elif CORO_IRIX |
|
|
321 | |
|
|
322 | setjmp (ctx->env); |
|
|
323 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
|
|
324 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); |
|
|
325 | |
|
|
326 | # elif CORO_ASM |
|
|
327 | |
|
|
328 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
|
|
329 | /* we try to allow for both functions with and without frame pointers */ |
|
|
330 | *--ctx->sp = (void *)coro_init; |
|
|
331 | { |
|
|
332 | void *frame = ctx->sp - 1; |
|
|
333 | int i; |
|
|
334 | for (i = NUM_SAVED; i--; ) |
|
|
335 | *--ctx->sp = frame; |
|
|
336 | } |
|
|
337 | |
|
|
338 | # endif |
|
|
339 | |
|
|
340 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
|
|
341 | |
|
|
342 | # elif CORO_PTHREAD |
|
|
343 | |
|
|
344 | pthread_t id; |
|
|
345 | pthread_attr_t attr; |
|
|
346 | coro_context nctx; |
413 | static coro_context nctx; |
347 | struct coro_init_args args; |
|
|
348 | static int once; |
414 | static int once; |
349 | |
415 | |
350 | if (!once) |
416 | if (!once) |
351 | { |
417 | { |
|
|
418 | once = 1; |
|
|
419 | |
352 | pthread_mutex_lock (&coro_mutex); |
420 | pthread_mutex_lock (&coro_mutex); |
353 | once = 1; |
421 | pthread_cond_init (&nctx.cv, 0); |
|
|
422 | null_tid = pthread_self (); |
354 | } |
423 | } |
355 | |
424 | |
|
|
425 | pthread_cond_init (&ctx->cv, 0); |
|
|
426 | |
|
|
427 | if (coro) |
|
|
428 | { |
|
|
429 | pthread_attr_t attr; |
|
|
430 | struct coro_init_args args; |
|
|
431 | |
356 | args.func = coro; |
432 | args.func = coro; |
357 | args.arg = arg; |
433 | args.arg = arg; |
358 | args.self = ctx; |
434 | args.self = ctx; |
359 | args.main = &nctx; |
435 | args.main = &nctx; |
360 | |
436 | |
361 | pthread_attr_init (&attr); |
437 | pthread_attr_init (&attr); |
362 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
438 | #if __UCLIBC__ |
|
|
439 | /* exists, but is borked */ |
|
|
440 | /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
|
|
441 | #elif __CYGWIN__ |
|
|
442 | /* POSIX, not here */ |
|
|
443 | pthread_attr_setstacksize (&attr, (size_t)ssize); |
|
|
444 | #else |
363 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
445 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
|
|
446 | #endif |
|
|
447 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
364 | pthread_create (&id, &attr, trampoline, &args); |
448 | pthread_create (&ctx->id, &attr, coro_init, &args); |
365 | |
449 | |
366 | pthread_cond_init (&args.self->c, 0); |
|
|
367 | coro_transfer (args.main, args.self); |
450 | coro_transfer (args.main, args.self); |
|
|
451 | } |
|
|
452 | else |
|
|
453 | ctx->id = null_tid; |
|
|
454 | } |
|
|
455 | |
|
|
456 | void |
|
|
457 | coro_destroy (coro_context *ctx) |
|
|
458 | { |
|
|
459 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
460 | { |
|
|
461 | pthread_cancel (ctx->id); |
|
|
462 | pthread_mutex_unlock (&coro_mutex); |
|
|
463 | pthread_join (ctx->id, 0); |
|
|
464 | pthread_mutex_lock (&coro_mutex); |
|
|
465 | } |
|
|
466 | |
|
|
467 | pthread_cond_destroy (&ctx->cv); |
|
|
468 | } |
368 | |
469 | |
369 | #else |
470 | #else |
370 | # error unsupported backend |
471 | # error unsupported backend |
371 | #endif |
472 | #endif |
372 | } |
|
|
373 | |
473 | |