Remove pthreads

Signed-off-by: Slendi <slendi@socopon.com>

CMakeLists.txt

@@ -2,7 +2,6 @@ cmake_minimum_required(VERSION 3.10)
 
 project(DCFG C)
 
-option(DCFG_PTHREAD_SUPPORT "Enable pthreads support" ON)
 option(DCFG_POSIX_SUPPORT   "Enable POSIX support"    ON)
 option(DCFG_BUILD_PROGRAMS  "Build DCFG example programs" ON)
 option(DCFG_ASAN            "Enable AddressSanitizer" OFF)
@@ -37,12 +36,6 @@ add_library(${PROJECT_NAME}_static STATIC ${SRC_DIR}/dcfg.c)
 	set_target_properties(${PROJECT_NAME}_static PROPERTIES OUTPUT_NAME "dcfg")
 
 foreach(TARGET ${PROJECT_NAME}_shared ${PROJECT_NAME}_static)
-	if(DCFG_PTHREAD_SUPPORT)
-		find_package(Threads REQUIRED)
-		target_link_libraries(${TARGET} PRIVATE Threads::Threads)
-		target_compile_definitions(${TARGET} PRIVATE DCFG_PTHREAD_SUPPORT)
-	endif()
-
 	if(DCFG_POSIX_SUPPORT)
 		target_compile_definitions(${TARGET} PRIVATE DCFG_POSIX_SUPPORT)
 	endif()
@@ -77,10 +70,6 @@ if(DCFG_BUILD_PROGRAMS)
 		target_include_directories(${PROG_NAME} PRIVATE ${INCLUDE_DIR})
 		target_link_libraries(${PROG_NAME} PRIVATE ${PROJECT_NAME}_static)
 
-		if(DCFG_PTHREAD_SUPPORT)
-			target_link_libraries(${PROG_NAME} PRIVATE Threads::Threads)
-		endif()
-
 		if(MSVC)
 			target_compile_options(${PROG_NAME} PRIVATE /W4 /permissive-)
 		else()

build.sh

@@ -6,7 +6,6 @@ BUILD_DIR="BUILD"
 INSTALL_DIR=$PWD/install
 CFLAGS="-Wall -Wextra -pedantic -Werror -Wno-newline-eof -Wno-language-extension-token -Wno-unused-command-line-argument"
 BUILD_SHARED=1
-PTHREAD_SUPPORT=1
 POSIX_SUPPORT=1
 BUILD_PROGRAMS=1
 SRC_DIR="src"
@@ -18,7 +17,6 @@ for arg in "$@"; do
 	case $arg in
 		--debug) CFLAGS="$CFLAGS -g -O0" ;;
 		--release) CFLAGS="$CFLAGS -O2" ;;
-		--no-pthread) PTHREAD_SUPPORT=0 ;;
 		--no-posix) POSIX_SUPPORT=0 ;;
 		--no-programs) BUILD_PROGRAMS=0 ;;
 		--clean) rm -rf "$BUILD_DIR" "$INSTALL_DIR"; echo "Cleaned."; exit 0 ;;
@@ -48,14 +46,6 @@ else
 	CFLAGS="$CFLAGS -std=c99"
 fi
 
-if [ "$PTHREAD_SUPPORT" -eq 1 ]; then
-	CFLAGS="$CFLAGS -DDCFG_PTHREAD_SUPPORT=1"
-	if [ "$OS" = "SunOS" ]; then
-		LIBS="$LIBS -mt"
-	else
-		LIBS="$LIBS -lpthread"
-	fi
-fi
 if [ "$POSIX_SUPPORT" -eq 1 ]; then
 	CFLAGS="$CFLAGS -DDCFG_POSIX_SUPPORT=1"
 fi

src/dcfg.c

@@ -42,33 +42,6 @@
 #	define _POSIX_C_SOURCE 0L
 #endif
 
-#if DCFG_PTHREAD_SUPPORT
-#	ifdef _POSIX_C_SOURCE
-#		undef _POSIX_C_SOURCE
-#	endif
-#	define _POSIX_C_SOURCE 200809L
-#	include <pthread.h>
-extern int pthread_mutexattr_settype(pthread_mutexattr_t *, int);
-#else
-#	if defined __USE_POSIX199506 || defined __USE_UNIX98
-#	else
-typedef struct {
-	int unused;
-} pthread_mutex_t;
-typedef struct {
-	int unused;
-} pthread_mutexattr_t;
-#		define PTHREAD_MUTEX_RECURSIVE_NP 0
-#	endif
-
-static void pthread_mutex_init(pthread_mutex_t *m, void *data) { (void)m; (void)data; }
-static void pthread_mutex_destroy(pthread_mutex_t *m) { (void)m; }
-static void pthread_mutex_lock(pthread_mutex_t *m) { (void)m; }
-static void pthread_mutex_unlock(pthread_mutex_t *m) { (void)m; }
-void pthread_mutexattr_init(pthread_mutexattr_t *attr);
-static void pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type) { (void)attr; (void)type; }
-#endif
-
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
@@ -79,7 +52,7 @@ static void pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type) { (vo
 #include <stdlib.h>
 #include <string.h>
 
-int64_t dcfg_strtoll(const char *s, char **end, int base)
+int64_t dcfg_strtoll(char const *s, char **end, int base)
 {
 	char const *p = s;
 	while (isspace((unsigned char)*p))
@@ -360,8 +333,6 @@ static void environment_destroy(Environment *env, bool destroy_values)
 }
 
 struct dcfg_Instance {
-	pthread_mutex_t mtx;
-
 	dcfg_AllocFn alloc;
 	dcfg_FreeFn free;
 	dcfg_RealpathFn realpath;
@@ -382,10 +353,21 @@ struct dcfg_Instance {
 
 static void *alloc(size_t size) { return calloc(1, size); }
 
+#ifdef __linux__
+#	include <linux/limits.h>
+#else
+#	ifndef PATH_MAX
+#		define PATH_MAX 4096
+#	endif
+#endif
+
 #if DCFG_POSIX_SUPPORT
-static char *realpath_(char const *s) {
+static char *realpath_(char const *s)
+{
 	char buf[PATH_MAX];
-	return strdup(realpath(s, buf));
+	char *ss = malloc(strlen(realpath(s, buf)) + 1);
+	strcpy(ss, s);
+	return ss;
 }
 void *fopen_(char const *f, char const *a) { return fopen(f, a); }
 int fseek_(void *f, size_t p, int o) { return fseek(f, p, o); }
@@ -399,12 +381,6 @@ dcfg_Version dcfg_get_version(void)
 	    | ((uint64_t)VERSION_PATCH & 0xFFFFFFFFULL);
 }
 
-#if __FreeBSD__
-#define MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE
-#else
-#define MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
-#endif
-
 dcfg_Instance *dcfg_make_instance(dcfg_InstanceCreateInfo const *create_info)
 {
 	assert(create_info);
@@ -414,11 +390,6 @@ dcfg_Instance *dcfg_make_instance(dcfg_InstanceCreateInfo const *create_info)
 		return NULL;
 	}
 
-	pthread_mutexattr_t attr;
-	pthread_mutexattr_init(&attr);
-	pthread_mutexattr_settype(&attr, MUTEX_RECURSIVE);
-	pthread_mutex_init(&instance->mtx, &attr);
-
 	instance->alloc = create_info->alloc;
 	instance->free = create_info->free;
 	if (!instance->alloc) {
@@ -482,13 +453,6 @@ void dcfg_destroy_instance(dcfg_Instance *instance)
 	}
 	vector_free(instance->sourcev);
 
-	pthread_mutex_lock(&instance->mtx);
-	{ // De-init other instance things
-	}
-	pthread_mutex_unlock(&instance->mtx);
-
-	pthread_mutex_destroy(&instance->mtx);
-
 	free(instance);
 }
 
@@ -498,15 +462,10 @@ char const *dcfg_last_error(dcfg_Instance *instance)
 
 	char const *ret = NULL;
 
-	pthread_mutex_lock(&instance->mtx);
-	{
-		if (!instance->last_error[0]) {
-			pthread_mutex_unlock(&instance->mtx);
-			return NULL;
-		}
-		ret = instance->last_error;
+	if (!instance->last_error[0]) {
+		return NULL;
 	}
-	pthread_mutex_unlock(&instance->mtx);
+	ret = instance->last_error;
 
 	return ret;
 }
@@ -1997,16 +1956,13 @@ bool dcfg_Value_evaluate_in_env(
 bool dcfg_call_function(
     dcfg_Value *fn, dcfg_Value **args, size_t argc, dcfg_Value **out_value)
 {
-	pthread_mutex_lock(&fn->instance->mtx);
 	if (fn->v.f.is_builtin) {
 		*out_value = fn->v.f.v.bi(args, argc);
-		pthread_mutex_unlock(&fn->instance->mtx);
 		return *out_value != NULL;
 	}
 
 	Environment frame;
 	if (!environment_create(&frame, fn->v.f.v.f.closure)) {
-		pthread_mutex_unlock(&fn->instance->mtx);
 		return false;
 	}
 
@@ -2014,7 +1970,6 @@ bool dcfg_call_function(
 	if (argc != nform) {
 		strcpy(fn->instance->last_error, "Invalid argument count");
 		environment_destroy(&frame, false);
-		pthread_mutex_unlock(&fn->instance->mtx);
 		return false;
 	}
 	for (size_t i = 0; i < nform; i++) {
@@ -2024,18 +1979,13 @@ bool dcfg_call_function(
 
 	bool ok = dcfg_Value_evaluate_in_env(fn->v.f.v.f.body, &frame, out_value);
 	environment_destroy(&frame, false);
-	pthread_mutex_unlock(&fn->instance->mtx);
 	return ok;
 }
 
 bool dcfg_Value_evaluate(dcfg_Value *value, dcfg_Value **out_value)
 {
 	bool ret;
-	pthread_mutex_lock(&value->instance->mtx);
-	{
-		ret = dcfg_Value_evaluate_in_env(value, NULL, out_value);
-	}
-	pthread_mutex_unlock(&value->instance->mtx);
+	ret = dcfg_Value_evaluate_in_env(value, NULL, out_value);
 	return ret;
 }