source: libcfa/src/concurrency/invoke.h@ 1e5dedc4

//
// 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 : Sat May 19 08:23:21 2018
// Update Count     : 31
//

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

#ifdef __cforall
extern "C" {
#endif

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

#ifdef __ARM_ARCH
        // function prototypes are only really used by these macros on ARM
        void disable_global_interrupts();
        void enable_global_interrupts();

        #define TL_GET( member ) ( { __typeof__( kernelTLS.member ) target; \
                disable_global_interrupts(); \
                target = kernelTLS.member; \
                enable_global_interrupts(); \
                target; } )
        #define TL_SET( member, value ) disable_global_interrupts(); \
                kernelTLS.member = value; \
                enable_global_interrupts();
#else
        #define TL_GET( member ) kernelTLS.member
        #define TL_SET( member, value ) kernelTLS.member = value;
#endif

        #ifdef __cforall
        extern "Cforall" {
                static inline struct thread_desc             * & get_next( struct thread_desc             & this );
                static inline struct __condition_criterion_t * & get_next( struct __condition_criterion_t & this );

                extern thread_local struct KernelThreadData {
                        struct thread_desc    * volatile this_thread;
                        struct processor      * volatile this_processor;

                        struct {
                                volatile unsigned short disable_count;
                                volatile bool enabled;
                                volatile bool in_progress;
                        } preemption_state;
                } kernelTLS __attribute__ ((tls_model ( "initial-exec" )));
        }
        #endif

        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;
        };

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

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

        struct coroutine_desc {
                // context that is switch during a CtxSwitch
                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_desc * starter;

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

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

        };

        // 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_desc {
                // spinlock to protect internal data
                struct __spinlock_t lock;

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

                // queue of threads that are blocked waiting for the monitor
                __queue_t(struct thread_desc) 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_desc*) );

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

        struct thread_desc {
                // Core threading fields
                // context that is switch during a CtxSwitch
                struct __stack_context_t context;

                // current execution status for coroutine
                enum coroutine_state state;

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

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

                // current active context
                struct coroutine_desc * curr_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;

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

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

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

                struct {
                        struct thread_desc * next;
                        struct thread_desc * prev;
                } node;
        };

        #ifdef __cforall
        extern "Cforall" {
                static inline struct coroutine_desc * active_coroutine() { return TL_GET( this_thread )->curr_cor; }
                static inline struct thread_desc    * active_thread   () { return TL_GET( this_thread    ); }
                static inline struct processor      * active_processor() { return TL_GET( this_processor ); } // UNSAFE

                static inline thread_desc * & get_next( thread_desc & this ) {
                        return this.next;
                }

                static inline [thread_desc *&, thread_desc *& ] __get( thread_desc & this ) {
                        return this.node.[next, prev];
                }

                static inline struct __condition_criterion_t * & get_next( struct __condition_criterion_t & this );

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

                static inline void ?{}(__monitor_group_t & this, struct monitor_desc ** 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 ) {
                        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 CtxInvokeStub( void );
        extern void CtxSwitch( struct __stack_context_t * from, struct __stack_context_t * to ) asm ("CtxSwitch");
        // 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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