Ignore:
Timestamp:
Jan 17, 2017, 1:33:11 PM (6 years ago)
Author:
Thierry Delisle <tdelisle@…>
Branches:
aaron-thesis, arm-eh, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, with_gc
Children:
2fc88be
Parents:
aed3f54
Message:

Moved coroutines code in libcfa to coroutines header

File:
1 edited

Legend:

Unmodified
Added
Removed
  • src/libcfa/concurrency/threads.c

    raed3f54 r6a3d2e7  
     1//                              -*- Mode: CFA -*-
    12//
    23// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
     
    56// file "LICENCE" distributed with Cforall.
    67//
    7 // threads.c --
     8// threads --
    89//
    910// Author           : Thierry Delisle
    10 // Created On       : Mon Nov 28 12:27:26 2016
     11// Created On       : Tue Jan 17 12:27:26 2016
    1112// Last Modified By : Thierry Delisle
    12 // Last Modified On : Mon Nov 28 12:27:26 2016
     13// Last Modified On : --
    1314// Update Count     : 0
    1415//
    1516
    16 extern "C" {
    17 #include <stddef.h>
    18 #include <malloc.h>
    19 #include <errno.h>
    20 #include <string.h>
    21 #include <unistd.h>
    22 #include <sys/mman.h>
    23 }
    2417
    25 #include "threads"
    26 #include "libhdr.h"
    27 
    28 #define __CFA_INVOKE_PRIVATE__
    29 #include "invoke.h"
    30 
    31 //-----------------------------------------------------------------------------
    32 // Global state variables
    33 
    34 // minimum feasible stack size in bytes
    35 #define MinStackSize 1000
    36 static size_t pageSize = 0;                             // architecture pagesize HACK, should go in proper runtime singleton
    37 
    38 //Extra private desctructor for the main
    39 //FIXME the main should not actually allocate a stack
    40 //Since the main is never resumed the extra stack does not cause
    41 //any problem but it is wasted memory
    42 void ?{}(coStack_t* this, size_t size);
    43 void ?{}(coroutine* this, size_t size);
    44 
    45 //Main coroutine
    46 //FIXME do not construct a stack for the main
    47 coroutine main_coroutine = { 1000 };
    48 
    49 //Current coroutine
    50 //Will need to be in TLS when multi-threading is added
    51 coroutine* current_coroutine = &main_coroutine;
    52 
    53 //-----------------------------------------------------------------------------
    54 // Coroutine ctors and dtors
    55 void ?{}(coStack_t* this) {
    56         this->size              = 10240;        // size of stack
    57         this->storage   = NULL; // pointer to stack
    58         this->limit             = NULL; // stack grows towards stack limit
    59         this->base              = NULL; // base of stack
    60         this->context   = NULL; // address of cfa_context_t
    61         this->top               = NULL; // address of top of storage
    62         this->userStack = false;       
    63 }
    64 
    65 void ?{}(coStack_t* this, size_t size) {
    66         this{};
    67         this->size = size;
    68 
    69         create_stack(this, this->size);
    70 }
    71 
    72 void ?{}(coroutine* this) {
    73         this->name = "Anonymous Coroutine";
    74         this->errno_ = 0;
    75         this->state = Start;
    76       this->notHalted = true;
    77         this->starter = NULL;
    78         this->last = NULL;
    79 }
    80 
    81 void ?{}(coroutine* this, size_t size) {
    82         this{};
    83         (&this->stack){size};
    84 }
    85 
    86 void ^?{}(coStack_t* this) {
    87         if ( ! this->userStack ) {
    88                 LIB_DEBUG_DO(
    89                         if ( mprotect( this->storage, pageSize, PROT_READ | PROT_WRITE ) == -1 ) {
    90                                 abortf( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", this, errno, strerror( errno ) );
    91                         }
    92                 );
    93                 free( this->storage );
    94         }
    95 }
    96 
    97 void ^?{}(coroutine* this) {}
    98 
    99 // Part of the Public API
    100 // Not inline since only ever called once per coroutine
    101 forall(dtype T | is_coroutine(T))
    102 void prime(T* cor) {
    103         coroutine* this = get_coroutine(cor);
    104         assert(this->state == Start);
    105 
    106         this->state = Primed;
    107         resume(cor);
    108 }
    109 
    110 // We need to call suspend from invoke.c, so we expose this wrapper that
    111 // is not inline (We can't inline Cforall in C)
    112 void suspend_no_inline(void) {
    113         suspend();
    114 }
    115 
    116 void corCxtSw(coroutine* src, coroutine* dst) {
    117         // THREAD_GETMEM( This )->disableInterrupts();
    118 
    119         // set state of current coroutine to inactive
    120         src->state = Inactive;
    121 
    122         // set new coroutine that task is executing
    123         current_coroutine = dst;                       
    124 
    125         // context switch to specified coroutine
    126         CtxSwitch( src->stack.context, dst->stack.context );
    127         // when CtxSwitch returns we are back in the src coroutine             
    128 
    129         // set state of new coroutine to active
    130         src->state = Active;
    131 
    132         // THREAD_GETMEM( This )->enableInterrupts();
    133 } //ctxSwitchDirect
    134 
    135 void create_stack( coStack_t* this, unsigned int storageSize ) {
    136         //TEMP HACK do this on proper kernel startup
    137         if(pageSize == 0ul) pageSize = sysconf( _SC_PAGESIZE );
    138 
    139         size_t cxtSize = libCeiling( sizeof(machine_context_t), 8 ); // minimum alignment
    140 
    141         if ( (intptr_t)this->storage == 0 ) {
    142                 this->userStack = false;
    143                 this->size = libCeiling( storageSize, 16 );
    144                 // use malloc/memalign because "new" raises an exception for out-of-memory
    145                
    146                 // assume malloc has 8 byte alignment so add 8 to allow rounding up to 16 byte alignment
    147                 LIB_DEBUG_DO( this->storage = memalign( pageSize, cxtSize + this->size + pageSize ) );
    148                 LIB_NO_DEBUG_DO( this->storage = malloc( cxtSize + this->size + 8 ) );
    149 
    150                 LIB_DEBUG_DO(
    151                         if ( mprotect( this->storage, pageSize, PROT_NONE ) == -1 ) {
    152                                 abortf( "(uMachContext &)%p.createContext() : internal error, mprotect failure, error(%d) %s.", this, (int)errno, strerror( (int)errno ) );
    153                         } // if
    154                 );
    155 
    156                 if ( (intptr_t)this->storage == 0 ) {
    157                         abortf( "Attempt to allocate %d bytes of storage for coroutine or task execution-state but insufficient memory available.", this->size );
    158                 } // if
    159 
    160                 LIB_DEBUG_DO( this->limit = (char *)this->storage + pageSize );
    161                 LIB_NO_DEBUG_DO( this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ) ); // minimum alignment
    162 
    163         } else {
    164                 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() );
    165                 this->userStack = true;
    166                 this->size = storageSize - cxtSize;
    167 
    168                 if ( this->size % 16 != 0u ) this->size -= 8;
    169 
    170                 this->limit = (char *)libCeiling( (unsigned long)this->storage, 16 ); // minimum alignment
    171         } // if
    172         assertf( this->size >= MinStackSize, "Stack size %d provides less than minimum of %d bytes for a stack.", this->size, MinStackSize );
    173 
    174         this->base = (char *)this->limit + this->size;
    175         this->context = this->base;
    176         this->top = (char *)this->context + cxtSize;
    177 }
    17818
    17919// Local Variables: //
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