source: libcfa/src/concurrency/invoke.h@ f76ff0b

//
// 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 : Thu Dec  5 16:26:03 2019
// Update Count     : 44
//

#include "bits/containers.hfa"
#include "bits/defs.hfa"
#include "bits/locks.hfa"
#include "kernel/fwd.hfa"

#ifdef __cforall
extern "C" {
#endif

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

        struct __cfaehm_try_resume_node;
        struct __cfaehm_base_exception_t;
        struct exception_context_t {
                struct __cfaehm_try_resume_node * top_resume;
                struct __cfaehm_base_exception_t * current_exception;
        };

        struct __stack_context_t {
                void * SP;
                void * FP;
        };

        // low adresses  :           +----------------------+ <- start of allocation
        //                           |  optional guard page |
        //                           +----------------------+ <- __stack_t.limit
        //                           |                      |
        //                           |       /\ /\ /\       |
        //                           |       || || ||       |
        //                           |                      |
        //                           |    program  stack    |
        //                           |                      |
        // __stack_info_t.storage -> +----------------------+ <- __stack_t.base
        //                           |      __stack_t       |
        // high adresses :           +----------------------+ <- end of allocation

        struct __stack_t {
                // stack grows towards stack limit
                void * limit;

                // base of stack
                void * base;

                // Information for exception handling.
                struct exception_context_t exception_context;
        };

        struct __stack_info_t {
                // pointer to stack
                struct __stack_t * storage;
        };

        enum __Coroutine_State { Halted, Start, Primed, Blocked, Ready, Active };

        struct $coroutine {
                // context that is switch during a __cfactx_switch
                struct __stack_context_t context;

                // stack information of the coroutine
                struct __stack_info_t stack;

                // textual name for coroutine/task
                const char * name;

                // current execution status for coroutine
                enum __Coroutine_State state;

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

                // last coroutine to resume this one
                struct $coroutine * last;

                // If non-null stack must be unwound with this exception
                struct _Unwind_Exception * cancellation;

        };

        static inline struct __stack_t * __get_stack( struct $coroutine * cor ) {
                return (struct __stack_t*)(((uintptr_t)cor->stack.storage) & ((uintptr_t)-2));
        }

        // struct which calls the monitor is accepting
        struct __waitfor_mask_t {
                // the index of the accepted function, -1 if none
                short * accepted;

                // list of acceptable functions, null if any
                __cfa_anonymous_object( __small_array_t(struct __acceptable_t) );
        };

        struct $monitor {
                // spinlock to protect internal data
                struct __spinlock_t lock;

                // current owner of the monitor
                struct $thread * owner;

                // queue of threads that are blocked waiting for the monitor
                __queue_t(struct $thread) entry_queue;

                // stack of conditions to run next once we exit the monitor
                __stack_t(struct __condition_criterion_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
                __cfa_anonymous_object( __small_array_t($monitor*) );

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

        // Link lists fields
        // instrusive link field for threads
        struct __thread_desc_link {
                struct $thread * next;
                struct $thread * prev;
                volatile unsigned long long ts;
                int preferred;
        };

        struct $thread {
                // Core threading fields
                // context that is switch during a __cfactx_switch
                struct __stack_context_t context;

                // current execution status for coroutine
                volatile int ticket;
                enum __Coroutine_State state:8;
                enum __Preemption_Reason preempted:8;

                //SKULLDUGGERY errno is not save in the thread data structure because returnToKernel appears to be the only function to require saving and restoring it

                // pointer to the cluster on which the thread is running
                struct cluster * curr_cluster;

                // Link lists fields
                // instrusive link field for threads
                struct __thread_desc_link link;

                // coroutine body used to store context
                struct $coroutine  self_cor;

                // current active context
                struct $coroutine * curr_cor;

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

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

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

                struct {
                        struct $thread * next;
                        struct $thread * prev;
                } node;

                #ifdef __CFA_DEBUG__
                        // previous function to park/unpark the thread
                        const char * park_caller;
                        int park_result;
                        enum __Coroutine_State park_state;
                        bool park_stale;
                        const char * unpark_caller;
                        int unpark_result;
                        enum __Coroutine_State unpark_state;
                        bool unpark_stale;
                #endif
        };

        #ifdef __CFA_DEBUG__
                void __cfaabi_dbg_record_thrd($thread & this, bool park, const char prev_name[]);
        #else
                #define __cfaabi_dbg_record_thrd(x, y, z)
        #endif

        #ifdef __cforall
        extern "Cforall" {

                static inline $thread *& get_next( $thread & this ) __attribute__((const)) {
                        return this.link.next;
                }

                static inline [$thread *&, $thread *& ] __get( $thread & this ) __attribute__((const)) {
                        return this.node.[next, prev];
                }

                static inline void ?{}(__monitor_group_t & this) {
                        (this.data){0p};
                        (this.size){0};
                        (this.func){NULL};
                }

                static inline void ?{}(__monitor_group_t & this, struct $monitor ** data, __lock_size_t size, fptr_t func) {
                        (this.data){data};
                        (this.size){size};
                        (this.func){func};
                }

                static inline bool ?==?( const __monitor_group_t & lhs, const __monitor_group_t & rhs ) __attribute__((const)) {
                        if( (lhs.data != 0) != (rhs.data != 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;
                }

                static inline void ?=?(__monitor_group_t & lhs, const __monitor_group_t & rhs) {
                        lhs.data = rhs.data;
                        lhs.size = rhs.size;
                        lhs.func = rhs.func;
                }
        }
        #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 __cfactx_invoke_stub( void );
        extern void __cfactx_switch( struct __stack_context_t * from, struct __stack_context_t * to ) asm ("__cfactx_switch");
        // void CtxStore ( void * this ) asm ("CtxStore");
        // void CtxRet   ( void * dst  ) asm ("CtxRet");

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

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