shithub: moonfish

--- a/README.md

+++ b/README.md

@@ -170,7 +170,7 @@

~~~

 # (example for x86-64)

-6c -I/sys/include/npe -Dmoonfish_no_threads chess.c search.c main.c

+6c -I/sys/include/npe -Dmoonfish_plan9 chess.c search.c main.c

 6l -o moonfish chess.6 search.6 main.6

 moonfish

~~~

--- a/main.c

+++ b/main.c

@@ -329,9 +329,7 @@

 #ifndef moonfish_no_threads

 	info.has_thread = 0;

-	options[0].value = sysconf(_SC_NPROCESSORS_ONLN);

-	if (options[0].value > options[0].max) options[0].value = options[0].max;

-	if (options[0].value < 1) options[0].value = 4;

+	options[0].value = 1;

 #endif

 	for (;;) {

--- a/search.c

+++ b/search.c

@@ -56,11 +56,10 @@

 struct moonfish_node {

 	struct moonfish_node *parent;

 	struct moonfish_node *children;

+	_Atomic int visits, count, uses;

 	_Atomic short int score;

-	_Atomic long int visits;

 	_Atomic unsigned char bounds[2];

-	_Atomic short int count;

-	_Atomic unsigned char ignored, uses;

+	_Atomic unsigned char ignored;

 	unsigned char from, index;

};

@@ -127,7 +126,7 @@

 static void moonfish_discard(struct moonfish_node *node)

-	short int i, count;

+	int i, count;

 #ifdef moonfish_no_threads

 	count = node->count;

@@ -249,7 +248,7 @@

 	struct moonfish_node *next;

 	float max_confidence, confidence;

-	short int i, count;

+	int i, count;

 	for (;;) {

--- a/threads.h

+++ b/threads.h

@@ -12,7 +12,34 @@

 #else

+#ifndef moonfish_plan9

 #include <stdatomic.h>

+#else

+#define moonfish_pthreads

+#define _Atomic

+int cas(int *pointer, int expected, int desired);

+static int atomic_compare_exchange_strong(int *pointer, int *expected, int desired)

+{

+	int value;

+	value = *pointer;

+	if (value == *expected && cas(pointer, value, desired)) return 1;

+	*expected = value;

+	return 0;

+}

+static void atomic_fetch_add(int *pointer, int addend)

+{

+	int value;

+	do value = *pointer;

+	while (!cas(pointer, value, value + addend));

+}

+#endif

 #ifndef moonfish_pthreads

--

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