source: src/libcfa/concurrency/invoke.h @ 3edc2df

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// invoke.h --
//
// Author           : Thierry Delisle
// Created On       : Tue Jan 17 12:27:26 2016
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Jul 21 22:28:56 2017
// Update Count     : 1
//

#include <stdbool.h>
#include <stdint.h>

#ifdef __CFORALL__
extern "C" {
#endif

#if ! defined(__CFA_INVOKE_PRIVATE__)
#ifndef _INVOKE_H_
#define _INVOKE_H_

        #define unlikely(x)    __builtin_expect(!!(x), 0)
        #define thread_local _Thread_local

        typedef void (*fptr_t)();
        typedef int_fast16_t __lock_size_t;

        struct spinlock {
                volatile int lock;
                #ifdef __CFA_DEBUG__
                        const char * prev_name;
                        void* prev_thrd;
                #endif
        };

        struct __thread_queue_t {
                struct thread_desc * head;
                struct thread_desc ** tail;
        };

        struct __condition_stack_t {
                struct __condition_criterion_t * top;
        };

        #ifdef __CFORALL__
        extern "Cforall" {
                void ?{}( struct __thread_queue_t & );
                void append( struct __thread_queue_t &, struct thread_desc * );
                struct thread_desc * pop_head( struct __thread_queue_t & );
                struct thread_desc * remove( struct __thread_queue_t &, struct thread_desc ** );

                void ?{}( struct __condition_stack_t & );
                void push( struct __condition_stack_t &, struct __condition_criterion_t * );
                struct __condition_criterion_t * pop( struct __condition_stack_t & );

                void  ?{}(spinlock & this);
                void ^?{}(spinlock & this);
        }
        #endif

        struct coStack_t {
                // size of stack
                size_t size;

                // pointer to stack
                void *storage;

                // stack grows towards stack limit
                void *limit;

                // base of stack
                void *base;

                // address of cfa_context_t
                void *context;

                // address of top of storage
                void *top;

                // whether or not the user allocated the stack
                bool userStack;
        };

        enum coroutine_state { Halted, Start, Inactive, Active, Primed };

        struct coroutine_desc {
                // stack information of the coroutine
                struct coStack_t stack;

                // textual name for coroutine/task, initialized by uC++ generated code
                const char *name;

                // copy of global UNIX variable errno
                int errno_;

                // current execution status for coroutine
                enum coroutine_state state;

                // first coroutine to resume this one
                struct coroutine_desc * starter;

                // last coroutine to resume this one
                struct coroutine_desc * last;
        };

        struct __waitfor_mask_t {
                // the index of the accepted function, -1 if none
                short * accepted;

                // list of acceptable functions, null if any
                struct __acceptable_t * clauses;

                // number of acceptable functions
                __lock_size_t size;
        };

        struct monitor_desc {
                // spinlock to protect internal data
                struct spinlock lock;

                // current owner of the monitor
                struct thread_desc * owner;

                // queue of threads that are blocked waiting for the monitor
                struct __thread_queue_t entry_queue;

                // stack of conditions to run next once we exit the monitor
                struct __condition_stack_t signal_stack;

                // monitor routines can be called recursively, we need to keep track of that
                unsigned int recursion;

                // mask used to know if some thread is waiting for something while holding the monitor
                struct __waitfor_mask_t mask;

                // node used to signal the dtor in a waitfor dtor
                struct __condition_node_t * dtor_node;
        };

        struct __monitor_group_t {
                // currently held monitors
                struct monitor_desc ** list;

                // number of currently held monitors
                __lock_size_t size;

                // last function that acquired monitors
                fptr_t func;
        };

        struct thread_desc {
                // Core threading fields
                // coroutine body used to store context
                struct coroutine_desc  self_cor;

                // monitor body used for mutual exclusion
                struct monitor_desc    self_mon;

                // pointer to monitor with sufficient lifetime for current monitors
                struct monitor_desc *  self_mon_p;

                // monitors currently held by this thread
                struct __monitor_group_t monitors;

                // Link lists fields
                // instrusive link field for threads
                struct thread_desc * next;
     };

     #ifdef __CFORALL__
     extern "Cforall" {
                static inline monitor_desc * ?[?]( const __monitor_group_t & this, ptrdiff_t index ) {
                        return this.list[index];
                }

                static inline bool ?==?( const __monitor_group_t & lhs, const __monitor_group_t & rhs ) {
                        if( (lhs.list != 0) != (rhs.list != 0) ) return false;
                        if( lhs.size != rhs.size ) return false;
                        if( lhs.func != rhs.func ) return false;

                        // Check that all the monitors match
                        for( int i = 0; i < lhs.size; i++ ) {
                                // If not a match, check next function
                                if( lhs[i] != rhs[i] ) return false;
                        }

                        return true;
                }
        }
        #endif

#endif //_INVOKE_H_
#else //! defined(__CFA_INVOKE_PRIVATE__)
#ifndef _INVOKE_PRIVATE_H_
#define _INVOKE_PRIVATE_H_

        struct machine_context_t {
                void *SP;
                void *FP;
                void *PC;
        };

        // assembler routines that performs the context switch
        extern void CtxInvokeStub( void );
        void CtxSwitch( void * from, void * to ) asm ("CtxSwitch");

        #if   defined( __x86_64__ )
        #define CtxGet( ctx ) __asm__ ( \
                        "movq %%rsp,%0\n"   \
                        "movq %%rbp,%1\n"   \
                : "=rm" (ctx.SP), "=rm" (ctx.FP) )
        #elif defined( __i386__ )
        #define CtxGet( ctx ) __asm__ ( \
                        "movl %%esp,%0\n"   \
                        "movl %%ebp,%1\n"   \
                : "=rm" (ctx.SP), "=rm" (ctx.FP) )
        #endif

#endif //_INVOKE_PRIVATE_H_
#endif //! defined(__CFA_INVOKE_PRIVATE__)
#ifdef __CFORALL__
}
#endif

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