Changeset 69d1748 for benchmark/readyQ/cycle.cpp

Timestamp:

Nov 18, 2020, 4:34:08 PM (4 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, master, new-ast-unique-expr, pthread-emulation, qualifiedEnum

Children:

7c9ac4a

Parents:

3ea8ad1

Message:

Some fixes to cycle benchmark and added a pthread version

File:

• benchmark/readyQ/cycle.cpp (modified) (3 diffs)

benchmark/readyQ/cycle.cpp

@@ -1 +1 @@
 
 #include "rq_bench.hpp"
+#include <libfibre/fibre.h>
 
+class __attribute__((aligned(128))) bench_sem {
+        Fibre * volatile ptr = nullptr;
+public:
+        inline bool wait() {
+                static Fibre * const ready  = reinterpret_cast<Fibre * const>(1ull);
+                for(;;) {
+                        Fibre * expected = this->ptr;
+                        if(expected == ready) {
+                                if(__atomic_compare_exchange_n(&this->ptr, &expected, nullptr, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
+                                        return false;
+                                }
+                        }
+                        else {
+                                /* paranoid */ assert( expected == nullptr );
+                                if(__atomic_compare_exchange_n(&this->ptr, &expected, fibre_self(), false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
+                                        fibre_park();
+                                        return true;
+                                }
+                        }
+
+                }
+        }
+
+        inline bool post() {
+                static Fibre * const ready  = reinterpret_cast<Fibre * const>(1ull);
+                for(;;) {
+                        Fibre * expected = this->ptr;
+                        if(expected == ready) return false;
+                        if(expected == nullptr) {
+                                if(__atomic_compare_exchange_n(&this->ptr, &expected, ready, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
+                                        return false;
+                                }
+                        }
+                        else {
+                                if(__atomic_compare_exchange_n(&this->ptr, &expected, nullptr, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
+                                        fibre_unpark( expected );
+                                        return true;
+                                }
+                        }
+                }
+        }
+};
 struct Partner {
         unsigned long long count  = 0;
@@ -55 +98 @@
                                 thddata[i].self.post();
                         }
-                        wait(start, is_tty);
+                        wait<Fibre>(start, is_tty);
 
                         stop = true;
@@ -62 +105 @@
 
                         for(int i = 0; i < tthreads; i++) {
+                                thddata[i].self.post();
                                 fibre_join( threads[i], nullptr );
                                 global_counter += thddata[i].count;