[8def349] | 1 | // -*- Mode: CFA -*- |
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[6a3d2e7] | 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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[75a17f1] | 8 | // coroutine.c -- |
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[6a3d2e7] | 9 | // |
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| 10 | // Author : Thierry Delisle |
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| 11 | // Created On : Mon Nov 28 12:27:26 2016 |
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| 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : Mon Nov 28 12:27:26 2016 |
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| 14 | // Update Count : 0 |
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| 15 | // |
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| 16 | |
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[75a17f1] | 17 | #include "coroutine" |
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[bd98b58] | 18 | |
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[6a3d2e7] | 19 | extern "C" { |
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| 20 | #include <stddef.h> |
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| 21 | #include <malloc.h> |
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| 22 | #include <errno.h> |
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| 23 | #include <string.h> |
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| 24 | #include <unistd.h> |
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| 25 | #include <sys/mman.h> |
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| 26 | } |
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| 27 | |
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[bd98b58] | 28 | #include "kernel" |
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[6a3d2e7] | 29 | #include "libhdr.h" |
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| 30 | |
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| 31 | #define __CFA_INVOKE_PRIVATE__ |
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| 32 | #include "invoke.h" |
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| 33 | |
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[4e6fb8e] | 34 | extern volatile thread_local processor * this_processor; |
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[bd98b58] | 35 | |
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[6a3d2e7] | 36 | //----------------------------------------------------------------------------- |
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| 37 | // Global state variables |
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| 38 | |
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| 39 | // minimum feasible stack size in bytes |
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| 40 | #define MinStackSize 1000 |
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| 41 | static size_t pageSize = 0; // architecture pagesize HACK, should go in proper runtime singleton |
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| 42 | |
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| 43 | //----------------------------------------------------------------------------- |
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| 44 | // Coroutine ctors and dtors |
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[242a902] | 45 | void ?{}(coStack_t& this) { |
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| 46 | this.size = 65000; // size of stack |
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| 47 | this.storage = NULL; // pointer to stack |
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| 48 | this.limit = NULL; // stack grows towards stack limit |
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| 49 | this.base = NULL; // base of stack |
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| 50 | this.context = NULL; // address of cfa_context_t |
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| 51 | this.top = NULL; // address of top of storage |
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| 52 | this.userStack = false; |
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[6a3d2e7] | 53 | } |
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| 54 | |
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[242a902] | 55 | void ?{}(coStack_t& this, size_t size) { |
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[6a3d2e7] | 56 | this{}; |
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[242a902] | 57 | this.size = size; |
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[6a3d2e7] | 58 | |
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[242a902] | 59 | create_stack(&this, this.size); |
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[6a3d2e7] | 60 | } |
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| 61 | |
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[242a902] | 62 | void ?{}(coroutine_desc& this) { |
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[db6f06a] | 63 | this{ "Anonymous Coroutine" }; |
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[6a3d2e7] | 64 | } |
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| 65 | |
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[242a902] | 66 | void ?{}(coroutine_desc& this, const char * name) { |
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| 67 | this.name = name; |
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| 68 | this.errno_ = 0; |
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| 69 | this.state = Start; |
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| 70 | this.starter = NULL; |
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| 71 | this.last = NULL; |
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[84e2523] | 72 | } |
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| 73 | |
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[242a902] | 74 | void ?{}(coroutine_desc& this, size_t size) { |
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[6a3d2e7] | 75 | this{}; |
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[242a902] | 76 | (this.stack){size}; |
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[6a3d2e7] | 77 | } |
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| 78 | |
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[242a902] | 79 | void ^?{}(coStack_t& this) { |
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[53a8e68] | 80 | if ( ! this.userStack ) { |
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[6a3d2e7] | 81 | LIB_DEBUG_DO( |
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[242a902] | 82 | if ( mprotect( this.storage, pageSize, PROT_READ | PROT_WRITE ) == -1 ) { |
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| 83 | abortf( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", &this, errno, strerror( errno ) ); |
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[6a3d2e7] | 84 | } |
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| 85 | ); |
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[242a902] | 86 | free( this.storage ); |
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[6a3d2e7] | 87 | } |
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| 88 | } |
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| 89 | |
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[242a902] | 90 | void ^?{}(coroutine_desc& this) {} |
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[6a3d2e7] | 91 | |
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| 92 | // Part of the Public API |
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| 93 | // Not inline since only ever called once per coroutine |
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| 94 | forall(dtype T | is_coroutine(T)) |
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[83a071f9] | 95 | void prime(T& cor) { |
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[c3acb841] | 96 | coroutine_desc* this = get_coroutine(cor); |
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[6a3d2e7] | 97 | assert(this->state == Start); |
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| 98 | |
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| 99 | this->state = Primed; |
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| 100 | resume(cor); |
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| 101 | } |
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| 102 | |
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[0c92c9f] | 103 | // Wrapper for co |
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[c3acb841] | 104 | void CoroutineCtxSwitch(coroutine_desc* src, coroutine_desc* dst) { |
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[6a3d2e7] | 105 | // THREAD_GETMEM( This )->disableInterrupts(); |
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| 106 | |
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| 107 | // set state of current coroutine to inactive |
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[1c273d0] | 108 | src->state = src->state == Halted ? Halted : Inactive; |
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[6a3d2e7] | 109 | |
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| 110 | // set new coroutine that task is executing |
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[1c273d0] | 111 | this_coroutine = dst; |
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[6a3d2e7] | 112 | |
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| 113 | // context switch to specified coroutine |
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[1c273d0] | 114 | assert( src->stack.context ); |
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[6a3d2e7] | 115 | CtxSwitch( src->stack.context, dst->stack.context ); |
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[47ecf2b] | 116 | // when CtxSwitch returns we are back in the src coroutine |
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[6a3d2e7] | 117 | |
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| 118 | // set state of new coroutine to active |
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| 119 | src->state = Active; |
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| 120 | |
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| 121 | // THREAD_GETMEM( This )->enableInterrupts(); |
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| 122 | } //ctxSwitchDirect |
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| 123 | |
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| 124 | void create_stack( coStack_t* this, unsigned int storageSize ) { |
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| 125 | //TEMP HACK do this on proper kernel startup |
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| 126 | if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE ); |
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| 127 | |
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| 128 | size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment |
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| 129 | |
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| 130 | if ( (intptr_t)this->storage == 0 ) { |
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| 131 | this->userStack = false; |
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| 132 | this->size = libCeiling( storageSize, 16 ); |
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| 133 | // use malloc/memalign because "new" raises an exception for out-of-memory |
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[47ecf2b] | 134 | |
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[6a3d2e7] | 135 | // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment |
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| 136 | LIB_DEBUG_DO( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) ); |
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| 137 | LIB_NO_DEBUG_DO( this->storage = malloc( cxtSize + this->size + 8 ) ); |
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| 138 | |
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| 139 | LIB_DEBUG_DO( |
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| 140 | if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) { |
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| 141 | abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) ); |
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| 142 | } // if |
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| 143 | ); |
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| 144 | |
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| 145 | if ( (intptr_t)this->storage == 0 ) { |
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| 146 | abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size ); |
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| 147 | } // if |
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| 148 | |
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| 149 | LIB_DEBUG_DO( this->limit = (char *)this->storage + pageSize ); |
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| 150 | LIB_NO_DEBUG_DO( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment |
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| 151 | |
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| 152 | } else { |
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| 153 | assertf( ((size_t)this->storage & (libAlign() - 1)) != 0ul, "Stack storage %p for task/coroutine must be aligned on %d byte boundary.", this->storage, (int)libAlign() ); |
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| 154 | this->userStack = true; |
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| 155 | this->size = storageSize - cxtSize; |
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| 156 | |
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| 157 | if ( this->size % 16 != 0u ) this->size -= 8; |
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| 158 | |
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| 159 | this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment |
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| 160 | } // if |
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| 161 | assertf( this->size >= MinStackSize, "Stack size %d provides less than minimum of %d bytes for a stack.", this->size, MinStackSize ); |
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| 162 | |
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| 163 | this->base = (char *)this->limit + this->size; |
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| 164 | this->context = this->base; |
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| 165 | this->top = (char *)this->context + cxtSize; |
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| 166 | } |
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| 167 | |
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[0c92c9f] | 168 | // We need to call suspend from invoke.c, so we expose this wrapper that |
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| 169 | // is not inline (We can't inline Cforall in C) |
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| 170 | extern "C" { |
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| 171 | void __suspend_internal(void) { |
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| 172 | suspend(); |
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| 173 | } |
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| 174 | } |
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| 175 | |
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[6a3d2e7] | 176 | // Local Variables: // |
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| 177 | // mode: c // |
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| 178 | // tab-width: 4 // |
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[4aa2fb2] | 179 | // End: // |
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