source: src/libcfa/concurrency/invoke.h @ 720a007

//
// 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 Feb  9 14:41:55 2018
// Update Count     : 6
//

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

#ifdef __cforall
extern "C" {
#endif

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

        #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 );
        }
        #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
                __small_array_t(struct __acceptable_t) __cfa_anonymous_object;
        };

        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
                __small_array_t(monitor_desc*) __cfa_anonymous_object;

                // 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;

                // 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;

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

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

                __cfaabi_dbg_debug_do(
                        // instrusive link field for debugging
                        struct thread_desc * dbg_next;
                        struct thread_desc * dbg_prev;
                )
     };

     #ifdef __cforall
     extern "Cforall" {
                static inline thread_desc * & get_next( thread_desc & this ) {
                        return this.next;
                }

                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 );
        void CtxSwitch( void * from, void * to ) asm ("CtxSwitch");

        #if   defined( __i386 )
        #define CtxGet( ctx ) __asm__ ( \
                        "movl %%esp,%0\n"   \
                        "movl %%ebp,%1\n"   \
                : "=rm" (ctx.SP), "=rm" (ctx.FP) )
        #elif defined( __x86_64 )
        #define CtxGet( ctx ) __asm__ ( \
                        "movq %%rsp,%0\n"   \
                        "movq %%rbp,%1\n"   \
                : "=rm" (ctx.SP), "=rm" (ctx.FP) )
        #elif defined( __ARM_ARCH )
        #define CtxGet( ctx ) __asm__ ( \
                        "mov %0,%%sp\n"   \
                        "mov %1,%%r11\n"   \
                : "=rm" (ctx.SP), "=rm" (ctx.FP) )
        #else
                #error unknown hardware architecture
        #endif

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

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