diff --git a/build.bat b/build.bat
index a1cd857..ccd88f3 100644
--- a/build.bat
+++ b/build.bat
@@ -28,36 +28,35 @@ if %target% == milepost (
 if %target% == orca (
 	echo building orca
 
-	set pthread_dir=..\vcpkg\packages\pthreads_x64-windows
-
 	::copy libraries
 	copy milepost\bin\milepost.dll bin
 	copy milepost\bin\milepost.dll.lib bin
-	copy %pthread_dir%\bin\pthreadVC3.dll bin
 
 	::generate wasm3 api bindings
-	python3 scripts\bindgen.py core src
+	python3 scripts\bindgen.py core src\core_api.json^
+			--wasm3-bindings src\core_api_bind_gen.c
 
-	python3 scripts\bindgen.py gles src
+	python3 scripts\bindgen.py gles src\gles_api.json^
+			--wasm3-bindings src\gles_api_bind_gen.c
 
-	python3 scripts\bindgen2.py canvas src\canvas_api.json^
+	python3 scripts\bindgen.py canvas src\canvas_api.json^
 	        --guest-stubs sdk\orca_surface.c^
 	        --guest-include graphics.h^
 	        --wasm3-bindings src\canvas_api_bind_gen.c
 
-	python3 scripts\bindgen2.py clock src\clock_api.json^
+	python3 scripts\bindgen.py clock src\clock_api.json^
 	        --guest-stubs sdk\orca_clock.c^
 	        --guest-include platform_clock.h^
 	        --wasm3-bindings src\clock_api_bind_gen.c
 
-	python3 scripts\bindgen2.py io^
+	python3 scripts\bindgen.py io^
 	        src\io_api.json^
 	        --guest-stubs sdk\io_stubs.c^
 	        --wasm3-bindings src\io_api_bind_gen.c
 
 	::compile orca
-	set INCLUDES=/I src /I sdk /I ext\wasm3\source /I milepost\src /I milepost\ext /I %pthread_dir%\include
-	set LIBS=/LIBPATH:bin /LIBPATH:%pthread_dir%\lib milepost.dll.lib wasm3.lib pthreadVC3.lib
+	set INCLUDES=/I src /I sdk /I ext\wasm3\source /I milepost\src /I milepost\ext
+	set LIBS=/LIBPATH:bin milepost.dll.lib wasm3.lib
 
-	cl /Zi /Zc:preprocessor /std:c11 %INCLUDES% src\main.c /link %LIBS% /out:bin\orca.exe
+	cl /Zi /Zc:preprocessor /std:c11 /experimental:c11atomics %INCLUDES% src\main.c /link %LIBS% /out:bin\orca.exe
 )
diff --git a/build.sh b/build.sh
index de9787d..6c84383 100755
--- a/build.sh
+++ b/build.sh
@@ -58,22 +58,28 @@ elif [ $target = orca ] ; then
 	FLAGS="-g -DLOG_COMPILE_DEBUG -mmacos-version-min=10.15.4 -maes"
 
 	# generate wasm3 api bindings
-	./scripts/bindgen.py core ./src
-	./scripts/bindgen.py gles ./src
 
-	python3 ./scripts/bindgen2.py canvas \
+	python3 ./scripts/bindgen.py core \
+		src/core_api.json \
+		--wasm3-bindings ./src/core_api_bind_gen.c
+
+	python3 ./scripts/bindgen.py gles \
+		src/gles_api.json \
+		--wasm3-bindings ./src/gles_api_bind_gen.c
+
+	python3 ./scripts/bindgen.py canvas \
 		src/canvas_api.json \
 		--guest-stubs sdk/orca_surface.c \
 		--guest-include graphics.h \
 		--wasm3-bindings ./src/canvas_api_bind_gen.c
 
-	python3 ./scripts/bindgen2.py clock \
+	python3 ./scripts/bindgen.py clock \
 		src/clock_api.json \
 		--guest-stubs sdk/orca_clock.c \
 		--guest-include platform_clock.h \
 		--wasm3-bindings ./src/clock_api_bind_gen.c
 
-	python3 ./scripts/bindgen2.py io \
+	python3 ./scripts/bindgen.py io \
 		src/io_api.json \
 		--guest-stubs sdk/io_stubs.c \
 		--wasm3-bindings ./src/io_api_bind_gen.c
diff --git a/milepost b/milepost
index 0caeccd..6221370 160000
--- a/milepost
+++ b/milepost
@@ -1 +1 @@
-Subproject commit 0caeccd3fba14e45f5666fa0f99fd719c9bef5fc
+Subproject commit 6221370aa0e8c520ebde179a1e715a8ed2e28611
diff --git a/scripts/bindgen.py b/scripts/bindgen.py
index 2eda83d..8ba1aa1 100755
--- a/scripts/bindgen.py
+++ b/scripts/bindgen.py
@@ -1,135 +1,221 @@
 #!/usr/bin/env python3
-import sys
 
-def bindgen(apiName, cdir):
-	inPath = cdir + '/bindgen_' + apiName + '_api.txt'
-	outPath = cdir + '/bindgen_' + apiName + '_api.c'
+from argparse import ArgumentParser
+import json
 
-	inFile = open(inPath, 'r')
-	outFile = open(outPath, 'w')
 
-	stubs = []
-	links = []
+def needs_arg_ptr_stub(decl):
+	res = (decl['ret']['tag'] == 'S')
+	for arg in decl['args']:
+		if arg['type']['tag'] == 'S':
+			res = True
+	return(res)
 
-	def gen_stub(name, sig, native_name):
-		if native_name == None:
-			native_name = name
 
-		src = 'const void* ' + name + '_stub(IM3Runtime runtime, IM3ImportContext _ctx, uint64_t * _sp, void * _mem)\n'
-		src += '{\n'
-		spIndex = 0
+def bindgen(apiName, spec, **kwargs):
+	guest_stubs_path = kwargs.get("guest_stubs")
+	guest_include = kwargs.get("guest_include")
+	wasm3_bindings_path = kwargs.get("wasm3_bindings")
 
-		parsingRet = True
-		retCount = 0
-		argCount = 0
-		retString = ''
-		argString = ''
+	if guest_stubs_path == None:
+		guest_stubs_path = 'bindgen_' + apiName + '_guest_stubs.c'
+	if wasm3_bindings_path == None:
+		wasm3_bindings_path = 'bindgen_' + apiName + '_wasm3_bindings.c'
 
-		for index, c in enumerate(sig):
-			if parsingRet:
-				if retCount > 1:
-					print('unsupported multiple return types\n')
-					break
-				if c == '(':
-					parsingRet = False
-					continue
-				elif c == ')':
-					print('unexpected ) while parsing return type\n')
-					break;
-				elif c == 'v':
-					continue
-				elif c == 'i':
-					retString = '*((i32*)&_sp[0]) = '
-				elif c == 'I':
-					retString = '*((i64*)&_sp[0]) = '
-				elif c == 'f':
-					retString = '*((f32*)&_sp[0]) = '
-				elif c == 'F':
-					retString = '*((f64*)&_sp[0]) = '
-				elif c == 'p':
-					print('returning pointers is not supported yet\n')
-					break
-				else:
-					print('unrecognized type ' + c + ' in procedure return\n')
-					break
-				retCount += 1
+	host_bindings = open(wasm3_bindings_path, 'w')
+	guest_bindings = None
+
+	specFile = open(spec, 'r')
+	data = json.load(specFile)
+
+	for decl in data:
+		if needs_arg_ptr_stub(decl):
+			guest_bindings = open(guest_stubs_path, 'w')
+			if guest_include != None:
+				s = '#include"' + guest_include + '"\n\n'
+				print(s, file=guest_bindings)
+			break
+
+	for decl in data:
+
+		name = decl['name']
+		cname = decl.get('cname', name)
+
+		if needs_arg_ptr_stub(decl):
+			argPtrStubName = name + '_argptr_stub'
+			# pointer arg stub declaration
+			s = ''
+			if decl['ret']['tag'] == 'S':
+				s += 'void'
 			else:
-				argIndex = argCount + retCount
-				if c == ')':
-					break
-				elif c == 'v':
-					break
-				elif c == 'i':
-					argString += '*(i32*)&_sp[' + str(argIndex) + ']'
-				elif c == 'I':
-					argString += '*(i64*)&_sp[' + str(argIndex) + ']'
-				elif c == 'f':
-					argString += '*(f32*)&_sp[' + str(argIndex) + ']'
-				elif c == 'F':
-					argString += '*(f64*)&_sp[' + str(argIndex) + ']'
-				elif c == 'p':
-					argString += '(void*)((char*)_mem + *(i32*)&_sp[' + str(argIndex) + '])'
+				s += decl['ret']['name']
+
+			s += ' ORCA_IMPORT(' + argPtrStubName + ') ('
+
+			if decl['ret']['tag'] == 'S':
+				s += decl['ret']['name'] + '* __retArg'
+				if len(decl['args']) > 0:
+					s += ', '
+
+			for i, arg in enumerate(decl['args']):
+				s += arg['type']['name']
+				if arg['type']['tag'] == 'S':
+					s += '*'
+				s += ' ' + arg['name']
+				if i+1 < len(decl['args']):
+					s += ', '
+			s += ');\n\n'
+
+			# forward function to pointer arg stub declaration
+			s += decl['ret']['name'] + ' ' + name + '('
+			for i, arg in enumerate(decl['args']):
+				s += arg['type']['name'] + ' ' + arg['name']
+				if i+1 < len(decl['args']):
+					s += ', '
+			s += ')\n'
+			s += '{\n'
+			s += '\t'
+			if decl['ret']['tag'] == 'S':
+				s += decl['ret']['name'] + ' __ret;\n\t'
+			elif decl['ret']['tag'] != 'v':
+				s += decl['ret']['name']
+				s += ' __ret = '
+			s += argPtrStubName + '('
+
+			if decl['ret']['tag'] == 'S':
+				s += '&__ret'
+				if len(decl['args']) > 0:
+					s += ', '
+
+			for i, arg in enumerate(decl['args']):
+				if arg['type']['tag'] == 'S':
+					s += '&'
+
+				s += arg['name']
+				if i+1 < len(decl['args']):
+					s += ', '
+			s += ');\n'
+			if decl['ret']['tag'] != 'v':
+				s += '\treturn(__ret);\n'
+			s += '}\n\n'
+
+			print(s, file=guest_bindings)
+
+		# host-side stub
+		s = 'const void* ' + cname + '_stub(IM3Runtime runtime, IM3ImportContext _ctx, uint64_t* _sp, void* _mem)'
+
+		gen_stub = decl.get('gen_stub', True)
+		if gen_stub == False:
+			s += ';\n\n'
+		else:
+			s += '\n{\n\t'
+			retTag = decl['ret']['tag']
+
+			if retTag == 'i':
+				s += '*((i32*)&_sp[0]) = '
+			elif retTag == 'I':
+				s += '*((i64*)&_sp[0]) = '
+			elif retTag == 'f':
+				s += '*((f32*)&_sp[0]) = '
+			elif retTag == 'F':
+				s += '*((f64*)&_sp[0]) = '
+			elif retTag == 'S':
+				retTypeName = decl['ret']['name']
+				retTypeCName = decl['ret'].get('cname', retTypeName)
+				s += '*(' + retTypeCName + '*)((char*)_mem + *(i32*)&_sp[0]) = '
+
+			s += cname + '('
+
+			firstArgIndex = 0
+			if retTag != 'v':
+				firstArgIndex = 1
+
+			for i, arg in enumerate(decl['args']):
+				typeName = arg['type']['name']
+				typeCName = arg['type'].get('cname', typeName)
+				argTag = arg['type']['tag']
+				if argTag == 'i':
+					s += '*(i32*)&_sp[' + str(firstArgIndex + i) + ']'
+				elif argTag == 'I':
+					s += '*(i64*)&_sp[' + str(firstArgIndex + i) + ']'
+				elif argTag == 'f':
+					s += '*(f32*)&_sp[' + str(firstArgIndex + i) + ']'
+				elif argTag == 'F':
+					s += '*(f64*)&_sp[' + str(firstArgIndex + i) + ']'
+				elif argTag == 'p':
+					s += '(void*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
+				elif argTag == 'S':
+					s += '*(' + typeCName + '*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
 				else:
 					print('unrecognized type ' + c + ' in procedure signature\n')
 					break
 
-				if index+2 < len(sig):
-					argString += ', '
-				argCount += 1
+				if i+1 < len(decl['args']):
+					s += ', '
 
-		src += '\t' + retString + native_name + '(' + argString + ');\n'
-		src += '\treturn(0);\n'
-		src += '}\n'
-		stubs.append(src)
+			s += ');\n\treturn(0);\n}\n\n'
 
-	def gen_link(name, sig):
-		m3_Sig = ''
-		for c in sig:
-			if c == 'p':
-				m3_Sig += 'i'
-			else:
-				m3_Sig += c
+		print(s, file=host_bindings)
 
-		src = '\tres = m3_LinkRawFunction(module, "*", "' + name + '", "' + m3_Sig + '", ' + name + '_stub);\n'
-		src += '\tif(res != m3Err_none && res != m3Err_functionLookupFailed) { log_error("error: %s\\n", res); return(-1); }\n\n'
-		links.append(src)
+	# link function
+	s = 'int bindgen_link_' + apiName + '_api(IM3Module module)\n{\n\t'
+	s += 'M3Result res;\n'
 
-	for line in inFile:
-		if line.isspace():
-			continue
-		desc = line.split()
+	for decl in data:
+		name = decl['name']
+		cname = decl.get('cname', name)
 
-		gen_stub(desc[0], desc[1], desc[2] if len(desc) > 2 else None)
-		gen_link(desc[0], desc[1])
+		if needs_arg_ptr_stub(decl):
+			name = name + '_argptr_stub'
 
-	linkProc = 'int bindgen_link_' + apiName + '_api(IM3Module module)\n'
-	linkProc += '{\n'
-	linkProc += '\tM3Result res;\n'
+		m3Sig = ''
+		if decl['ret']['tag'] == 'S':
+			m3Sig += 'v'
+		else:
+			m3Sig += decl['ret']['tag']
 
-	for link in links:
-		linkProc += link
+		m3Sig += '('
+		if decl['ret']['tag'] == 'S':
+			m3Sig += 'i'
+		for arg in decl['args']:
+			tag = arg['type']['tag']
+			if tag == 'p' or tag == 'S':
+				tag = 'i'
+			m3Sig += tag
+		m3Sig += ')'
 
-	linkProc += '\treturn(0);\n'
-	linkProc += '}\n'
 
-	for stub in stubs:
-		outFile.write(stub)
+		s += '\tres = m3_LinkRawFunction(module, "*", "' + name + '", "' + m3Sig + '", ' + cname + '_stub);\n'
+		s += '\tif(res != m3Err_none && res != m3Err_functionLookupFailed) { log_error("error: %s\\n", res); return(-1); }\n\n'
 
-	outFile.write('\n')
-	outFile.write(linkProc)
 
-	inFile.close()
-	outFile.close()
+	s += '\treturn(0);\n}\n'
+
+	print(s, file=host_bindings)
+
 
 if __name__ == "__main__":
-	if len(sys.argv) < 2:
-		print("bindgen require an api name\n")
-		exit(-1)
+	parser = ArgumentParser(prog='bindgen.py')
+	parser.add_argument('api')
+	parser.add_argument('spec')
+	parser.add_argument('-g', '--guest-stubs')
+	parser.add_argument('--guest-include')
+	parser.add_argument('--wasm3-bindings')
 
-	apiName = sys.argv[1]
-	cdir = ''
+	args = parser.parse_args()
 
-	if len(sys.argv) > 2:
-		cdir = sys.argv[2]
+	apiName = args.api
+	spec = args.spec
+	guest_stubs_path = args.guest_stubs
+	if guest_stubs_path == None:
+		guest_stubs_path = 'bindgen_' + apiName + '_guest_stubs.c'
+
+	wasm3_bindings_path = args.wasm3_bindings
+	if wasm3_bindings_path == None:
+		wasm3_bindings_path = 'bindgen_' + apiName + '_wasm3_bindings.c'
 	
-	bindgen(apiName, cdir)
+	bindgen(apiName, spec,
+		guest_stubs=guest_stubs_path,
+		guest_include=args.guest_include,
+		wasm3_bindings=wasm3_bindings_path,
+	)
diff --git a/scripts/bindgen2.py b/scripts/bindgen2.py
deleted file mode 100644
index 3dde8b1..0000000
--- a/scripts/bindgen2.py
+++ /dev/null
@@ -1,214 +0,0 @@
-#!/usr/bin/env python3
-
-from argparse import ArgumentParser
-import json
-
-def needs_arg_ptr_stub(decl):
-	res = (decl['ret']['tag'] == 'S')
-	for arg in decl['args']:
-		if arg['type']['tag'] == 'S':
-			res = True
-	return(res)
-
-def bindgen2(apiName, spec, **kwargs):
-	guest_stubs_path = kwargs["guest_stubs"]
-	guest_include = kwargs.get("guest-include")
-	wasm3_bindings_path = kwargs["wasm3_bindings"]
-
-	host_bindings = open(wasm3_bindings_path, 'w')
-	guest_bindings = None
-
-	specFile = open(spec, 'r')
-	data = json.load(specFile)
-
-	for decl in data:
-		if needs_arg_ptr_stub(decl):
-			guest_bindings = open(guest_stubs_path, 'w')
-			if guest_include != None:
-				s = '#include"' + guest_include + '"\n\n'
-				print(s, file=guest_bindings)
-			break
-
-	for decl in data:
-
-		name = decl['name']
-		cname = decl.get('cname', name)
-
-		if needs_arg_ptr_stub(decl):
-			argPtrStubName = name + '_argptr_stub'
-			# pointer arg stub declaration
-			s = ''
-			if decl['ret']['tag'] == 'S':
-				s += 'void'
-			else:
-				s += decl['ret']['name']
-
-			s += ' ORCA_IMPORT(' + argPtrStubName + ') ('
-
-			if decl['ret']['tag'] == 'S':
-				s += decl['ret']['name'] + '* __retArg'
-				if len(decl['args']) > 0:
-					s += ', '
-
-			for i, arg in enumerate(decl['args']):
-				s += arg['type']['name']
-				if arg['type']['tag'] == 'S':
-					s += '*'
-				s += ' ' + arg['name']
-				if i+1 < len(decl['args']):
-					s += ', '
-			s += ');\n\n'
-
-			# forward function to pointer arg stub declaration
-			s += decl['ret']['name'] + ' ' + name + '('
-			for i, arg in enumerate(decl['args']):
-				s += arg['type']['name'] + ' ' + arg['name']
-				if i+1 < len(decl['args']):
-					s += ', '
-			s += ')\n'
-			s += '{\n'
-			s += '\t'
-			if decl['ret']['tag'] == 'S':
-				s += decl['ret']['name'] + ' __ret;\n\t'
-			elif decl['ret']['tag'] != 'v':
-				s += decl['ret']['name']
-				s += ' __ret = '
-			s += argPtrStubName + '('
-
-			if decl['ret']['tag'] == 'S':
-				s += '&__ret'
-				if len(decl['args']) > 0:
-					s += ', '
-
-			for i, arg in enumerate(decl['args']):
-				if arg['type']['tag'] == 'S':
-					s += '&'
-
-				s += arg['name']
-				if i+1 < len(decl['args']):
-					s += ', '
-			s += ');\n'
-			if decl['ret']['tag'] != 'v':
-				s += '\treturn(__ret);\n'
-			s += '}\n\n'
-
-			print(s, file=guest_bindings)
-
-		# host-side stub
-		s = 'const void* ' + cname + '_stub(IM3Runtime runtime, IM3ImportContext _ctx, uint64_t* _sp, void* _mem)'
-
-		gen_stub = decl.get('gen_stub', True)
-		if gen_stub == False:
-			s += ';\n\n'
-		else:
-			s += '\n{\n\t'
-			retTag = decl['ret']['tag']
-
-			if retTag == 'i':
-				s += '*((i32*)&_sp[0]) = '
-			elif retTag == 'I':
-				s += '*((i64*)&_sp[0]) = '
-			elif retTag == 'f':
-				s += '*((f32*)&_sp[0]) = '
-			elif retTag == 'F':
-				s += '*((f64*)&_sp[0]) = '
-			elif retTag == 'S':
-				retTypeName = decl['ret']['name']
-				retTypeCName = decl['ret'].get('cname', retTypeName)
-				s += '*(' + retTypeCName + '*)((char*)_mem + *(i32*)&_sp[0]) = '
-
-			s += cname + '('
-
-			firstArgIndex = 0
-			if retTag != 'v':
-				firstArgIndex = 1
-
-			for i, arg in enumerate(decl['args']):
-				typeName = arg['type']['name']
-				typeCName = arg['type'].get('cname', typeName)
-				argTag = arg['type']['tag']
-				if argTag == 'i':
-					s += '*(i32*)&_sp[' + str(firstArgIndex + i) + ']'
-				elif argTag == 'I':
-					s += '*(i64*)&_sp[' + str(firstArgIndex + i) + ']'
-				elif argTag == 'f':
-					s += '*(f32*)&_sp[' + str(firstArgIndex + i) + ']'
-				elif argTag == 'F':
-					s += '*(f64*)&_sp[' + str(firstArgIndex + i) + ']'
-				elif argTag == 'p':
-					s += '(void*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
-				elif argTag == 'S':
-					s += '*(' + typeCName + '*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
-				else:
-					print('unrecognized type ' + c + ' in procedure signature\n')
-					break
-
-				if i+1 < len(decl['args']):
-					s += ', '
-
-			s += ');\n\treturn(0);\n}\n\n'
-
-		print(s, file=host_bindings)
-
-	# link function
-	s = 'int bindgen_link_' + apiName + '_api(IM3Module module)\n{\n\t'
-	s += 'M3Result res;\n'
-
-	for decl in data:
-		name = decl['name']
-		cname = decl.get('cname', name)
-
-		if needs_arg_ptr_stub(decl):
-			name = name + '_argptr_stub'
-
-		m3Sig = ''
-		if decl['ret']['tag'] == 'S':
-			m3Sig += 'v'
-		else:
-			m3Sig += decl['ret']['tag']
-
-		m3Sig += '('
-		if decl['ret']['tag'] == 'S':
-			m3Sig += 'i'
-		for arg in decl['args']:
-			tag = arg['type']['tag']
-			if tag == 'p' or tag == 'S':
-				tag = 'i'
-			m3Sig += tag
-		m3Sig += ')'
-
-
-		s += '\tres = m3_LinkRawFunction(module, "*", "' + name + '", "' + m3Sig + '", ' + cname + '_stub);\n'
-		s += '\tif(res != m3Err_none && res != m3Err_functionLookupFailed) { log_error("error: %s\\n", res); return(-1); }\n\n'
-
-
-	s += '\treturn(0);\n}\n'
-
-	print(s, file=host_bindings)
-
-
-if __name__ == "__main__":
-	parser = ArgumentParser(prog='bindgen.py')
-	parser.add_argument('api')
-	parser.add_argument('spec')
-	parser.add_argument('-g', '--guest-stubs')
-	parser.add_argument('--guest-include')
-	parser.add_argument('--wasm3-bindings')
-
-	args = parser.parse_args()
-
-	apiName = args.api
-	spec = args.spec
-	guest_stubs_path = args.guest_stubs
-	if guest_stubs_path == None:
-		guest_stubs_path = 'bindgen_' + apiName + '_guest_stubs.c'
-
-	wasm3_bindings_path = args.wasm3_bindings
-	if wasm3_bindings_path == None:
-		wasm3_bindings_path = 'bindgen_' + apiName + '_wasm3_bindings.c'
-	
-	bindgen2(apiName, spec,
-		guest_stubs_path=guest_stubs_path,
-		guest_include=args.guest_include,
-		wasm3_bindings_path=wasm3_bindings_path,
-	)
diff --git a/scripts/bundle.py b/scripts/bundle.py
index ca7a62c..10f7ae7 100644
--- a/scripts/bundle.py
+++ b/scripts/bundle.py
@@ -207,13 +207,11 @@ def windows_make_app(args):
 	milepost_lib = args.orca_dir + '/build/bin/milepost.dll'
 	gles_lib = args.orca_dir + '/milepost/build/bin/libGLESv2.dll'
 	egl_lib = args.orca_dir + '/milepost/build/bin/libEGL.dll'
-	pthread_lib = args.orca_dir + '/build/bin/pthreadVC3.dll'
 
 	shutil.copy(orca_exe, exe_dir)
 	shutil.copy(milepost_lib, exe_dir)
 	shutil.copy(gles_lib, exe_dir)
 	shutil.copy(egl_lib, exe_dir)
-	shutil.copy(pthread_lib, exe_dir)
 
 	#-----------------------------------------------------------
 	#NOTE: copy wasm module and data
@@ -248,8 +246,10 @@ def windows_make_app(args):
 	#-----------------------------------------------------------
 	#TODO
 
+
 if __name__ == "__main__":
 	parser = ArgumentParser(prog='mkapp')
 	init_parser(parser)
 
 	args = parser.parse_args()
+	make_app(args)
diff --git a/scripts/dev.py b/scripts/dev.py
index 9ca30b7..9f3e33d 100644
--- a/scripts/dev.py
+++ b/scripts/dev.py
@@ -10,7 +10,6 @@ from zipfile import ZipFile
 
 from . import checksum
 from .bindgen import bindgen
-from .bindgen2 import bindgen2
 from .log import *
 from .utils import pushd, removeall
 
@@ -109,6 +108,7 @@ def build_milepost_lib_win(release):
         "src\\glsl_shaders\\backprop.glsl",
         "src\\glsl_shaders\\merge.glsl",
         "src\\glsl_shaders\\raster.glsl",
+        "src\\glsl_shaders\\balance_workgroups.glsl",
     ])
 
     includes = [
@@ -140,7 +140,7 @@ def build_milepost_lib_win(release):
         "cl",
         "/we4013", "/Zi", "/Zc:preprocessor",
         "/DMP_BUILD_DLL",
-        "/std:c11",
+        "/std:c11", "/experimental:c11atomics",
         *includes,
         "src/milepost.c", "/Fo:bin/milepost.o",
         "/LD", "/link",
@@ -293,37 +293,30 @@ def build_orca(release):
 
 
 def build_orca_win(release):
-    pthread_dir = "..\\vcpkg\\packages\\pthreads_x64-windows"
-
     # copy libraries
     shutil.copy("milepost\\bin\\milepost.dll", "bin")
     shutil.copy("milepost\\bin\\milepost.dll.lib", "bin")
-    shutil.copy(os.path.join(pthread_dir, "bin\\pthreadVC3.dll"), "bin")
 
     gen_all_bindings()
 
     # compile orca
-    pthread_include = os.path.join(pthread_dir, "include")
     includes = [
         "/I", "src",
         "/I", "sdk",
         "/I", "ext\wasm3\source",
         "/I", "milepost\src",
         "/I", "milepost\ext",
-        "/I", pthread_include,
     ]
-    pthread_lib = os.path.join(pthread_dir, "lib")
     libs = [
         "/LIBPATH:bin",
-        f"/LIBPATH:{pthread_lib}",
         "milepost.dll.lib",
         "wasm3.lib",
-        "pthreadVC3.lib",
     ]
 
     subprocess.run([
         "cl",
-        "/Zi", "/Zc:preprocessor", "/std:c11",
+        "/Zi", "/Zc:preprocessor",
+        "/std:c11", "/experimental:c11atomics",
         *includes,
         "src\\main.c",
         "/link", *libs,
@@ -378,20 +371,24 @@ def build_orca_mac(release):
 
 
 def gen_all_bindings():
-    bindgen("core", "src")
-    bindgen("gles", "src")
+    bindgen("core", "src/core_api.json",
+        wasm3_bindings="src/core_api_bind_gen.c",
+    )
+    bindgen("gles", "src/gles_api.json",
+        wasm3_bindings="src/gles_api_bind_gen.c",
+    )
 
-    bindgen2("canvas", "src/canvas_api.json",
+    bindgen("canvas", "src/canvas_api.json",
         guest_stubs="sdk/orca_surface.c",
         guest_include="graphics.h",
         wasm3_bindings="src/canvas_api_bind_gen.c",
     )
-    bindgen2("clock", "src/clock_api.json",
+    bindgen("clock", "src/clock_api.json",
         guest_stubs="sdk/orca_clock.c",
         guest_include="platform_clock.h",
         wasm3_bindings="src/clock_api_bind_gen.c",
     )
-    bindgen2("io", "src/io_api.json",
+    bindgen("io", "src/io_api.json",
         guest_stubs="sdk/io_stubs.c",
         wasm3_bindings="src/io_api_bind_gen.c",
     )
diff --git a/src/bindgen_core_api.txt b/src/bindgen_core_api.txt
deleted file mode 100644
index f72ab71..0000000
--- a/src/bindgen_core_api.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-cosf f(f)
-sinf f(f)
-floorf f(f)
-sqrtf f(f)
-cos F(F)
-sin F(F)
-sqrt F(F)
-fabs F(F)
-
-orca_log v(iipipiip)
-orca_mem_grow i(I)
-orca_assert i(ppipp)
diff --git a/src/bindgen_gles_api.txt b/src/bindgen_gles_api.txt
deleted file mode 100644
index 03c8df4..0000000
--- a/src/bindgen_gles_api.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-glCreateProgram i(v)
-glCreateShader i(i)
-glCompileShader v(i)
-glAttachShader v(ii)
-glLinkProgram v(i)
-glUseProgram v(i)
-glGetError i(v)
-glClearColor v(ffff)
-glClear	v(i)
-glViewport v(iiii)
-
-glGetShaderiv v(iip)
-glGetShaderInfoLog v(iipp)
-
-glBindFramebuffer v(ii)
-glBindTexture v(ii)
-glActiveTexture v(i)
-
-glGenBuffers v(ip)
-glGenTextures v(ip)
-glGenFramebuffers v(ip)
-
-glFramebufferTexture2D v(iiiii)
-glCheckFramebufferStatus i(i)
-
-glTexImage2D v(iiiiiiiip)
-glTexParameteri v(iii)
-
-glBindBuffer v(ii)
-glBufferData v(iipi)
-
-glUniform1i v(ii)
-glUniform2i v(iii)
-glUniform1f v(if)
-glUniform2f v(iff)
-glUniform3f v(ifff)
-glUniformMatrix4fv v(iiip)
-
-glGetAttribLocation i(ip)
-glGetUniformLocation i(ip)
-
-glVertexAttribPointer v(iiiiip)
-glEnableVertexAttribArray v(i)
-glDrawArrays v(iii)
diff --git a/src/core_api.json b/src/core_api.json
new file mode 100644
index 0000000..061dfac
--- /dev/null
+++ b/src/core_api.json
@@ -0,0 +1,103 @@
+[
+{
+	"name": "cosf",
+	"cname": "cosf",
+	"ret": {"name": "float", "tag": "f"},
+	"args": [ {"name": "x",
+			   "type": {"name": "float", "tag": "f"}}]
+},
+{
+	"name": "sinf",
+	"cname": "sinf",
+	"ret": {"name": "float", "tag": "f"},
+	"args": [ {"name": "x",
+			   "type": {"name": "float", "tag": "f"}}]
+},
+{
+	"name": "floorf",
+	"cname": "floorf",
+	"ret": {"name": "float", "tag": "f"},
+	"args": [ {"name": "x",
+			   "type": {"name": "float", "tag": "f"}}]
+},
+{
+	"name": "sqrtf",
+	"cname": "sqrtf",
+	"ret": {"name": "float", "tag": "f"},
+	"args": [ {"name": "x",
+			   "type": {"name": "float", "tag": "f"}}]
+},
+{
+	"name": "cos",
+	"cname": "cos",
+	"ret": {"name": "double", "tag": "F"},
+	"args": [ {"name": "x",
+			   "type": {"name": "double", "tag": "F"}}]
+},
+{
+	"name": "sin",
+	"cname": "sin",
+	"ret": {"name": "double", "tag": "F"},
+	"args": [ {"name": "x",
+			   "type": {"name": "double", "tag": "F"}}]
+},
+{
+	"name": "sqrt",
+	"cname": "sqrt",
+	"ret": {"name": "double", "tag": "F"},
+	"args": [ {"name": "x",
+			   "type": {"name": "double", "tag": "F"}}]
+},
+{
+	"name": "fabs",
+	"cname": "fabs",
+	"ret": {"name": "double", "tag": "F"},
+	"args": [ {"name": "x",
+			   "type": {"name": "double", "tag": "F"}}]
+},
+{
+	"name": "orca_log",
+	"cname": "orca_log",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "level",
+			   "type": {"name": "log_level", "tag": "i"}},
+			  {"name": "fileLen",
+			   "type": {"name": "int", "tag": "i"}},
+			  {"name": "file",
+			   "type": {"name": "char*", "tag": "p"}},
+			  {"name": "functionLen",
+			   "type": {"name": "int", "tag": "i"}},
+			  {"name": "function",
+			   "type": {"name": "char*", "tag": "p"}},
+			  {"name": "line",
+			   "type": {"name": "int", "tag": "i"}},
+			  {"name": "msgLen",
+			   "type": {"name": "int", "tag": "i"}},
+			  {"name": "msg",
+			   "type": {"name": "char*", "tag": "p"}}
+			]
+},
+{
+	"name": "orca_mem_grow",
+	"cname": "orca_mem_grow",
+	"ret": {"name": "int", "tag": "i"},
+	"args": [ {"name": "size",
+			   "type": {"name": "u64", "tag": "I"}}]
+},
+{
+	"name": "orca_assert",
+	"cname": "orca_assert",
+	"ret": {"name": "int", "tag": "i"},
+	"args": [ {"name": "file",
+			   "type": {"name": "const char*", "tag": "p"}},
+			  {"name": "function",
+			   "type": {"name": "const char*", "tag": "p"}},
+			  {"name": "line",
+			   "type": {"name": "int", "tag": "i"}},
+			  {"name": "src",
+			   "type": {"name": "const char*", "tag": "p"}},
+			  {"name": "note",
+			   "type": {"name": "const char*", "tag": "p"}}
+			]
+}
+]
diff --git a/src/gles_api.json b/src/gles_api.json
new file mode 100644
index 0000000..fcd6982
--- /dev/null
+++ b/src/gles_api.json
@@ -0,0 +1,383 @@
+[
+{
+	"name": "glCreateProgram",
+	"cname": "glCreateProgram",
+	"ret": {"name": "int", "tag": "i"},
+	"args": []
+},
+{
+	"name": "glCreateShader",
+	"cname": "glCreateShader",
+	"ret": {"name": "int", "tag": "i"},
+	"args": [ {"name": "shaderType",
+			   "type": {"name": "GLenum", "tag": "i"}}]
+},
+{
+	"name": "glCompileShader",
+	"cname": "glCompileShader",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "shader",
+			   "type": {"name": "GLuint", "tag": "i"}}]
+},
+{
+	"name": "glAttachShader",
+	"cname": "glAttachShader",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "program",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "shader",
+			   "type": {"name": "GLuint", "tag": "i"}}
+			]
+},
+{
+	"name": "glLinkProgram",
+	"cname": "glLinkProgram",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "program",
+			   "type": {"name": "GLuint", "tag": "i"}}]
+},
+{
+	"name": "glUseProgram",
+	"cname": "glUseProgram",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "program",
+			   "type": {"name": "GLuint", "tag": "i"}}]
+},
+{
+	"name": "glGetError",
+	"cname": "glGetError",
+	"ret": {"name": "GLenum", "tag": "i"},
+	"args": []
+},
+{
+	"name": "glClearColor",
+	"cname": "glClearColor",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "red",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "green",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "blue",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "alpha",
+			   "type": {"name": "GLfloat", "tag": "f"}}
+			]
+},
+{
+	"name": "glClear",
+	"cname": "glClear",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "mask",
+			   "type": {"name": "GLbitfield", "tag": "i"}}]
+},
+{
+	"name": "glViewport",
+	"cname": "glViewport",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "x",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "y",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "width",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "height",
+			   "type": {"name": "GLsizei", "tag": "i"}}
+			]
+},
+{
+	"name": "glGetShaderiv",
+	"cname": "glGetShaderiv",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "shader",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "pname",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "params",
+			   "type": {"name": "GLint*", "tag": "p"}}
+			]
+},
+{
+	"name": "glGetShaderInfoLog",
+	"cname": "glGetShaderInfoLog",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "shader",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "maxLength",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "length",
+			   "type": {"name": "GLsizei", "tag": "p"}},
+			  {"name": "infoLog",
+			   "type": {"name": "GLchar", "tag": "p"}}
+			]
+},
+{
+	"name": "glBindFramebuffer",
+	"cname": "glBindFramebuffer",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "framebuffer",
+			   "type": {"name": "GLuint", "tag": "i"}}
+			]
+},
+{
+	"name": "glBindTexture",
+	"cname": "glBindTexture",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "texture",
+			   "type": {"name": "GLuint", "tag": "i"}}
+			]
+},
+{
+	"name": "glActiveTexture",
+	"cname": "glActiveTexture",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "texture",
+			   "type": {"name": "GLuint", "tag": "i"}}]
+},
+{
+	"name": "glGenBuffers",
+	"cname": "glGenBuffers",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "n",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "buffers",
+			   "type": {"name": "GLuint*", "tag": "p"}}
+			]
+},
+{
+	"name": "glGenTextures",
+	"cname": "glGenTextures",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "n",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "textures",
+			   "type": {"name": "GLuint*", "tag": "p"}}
+			]
+},
+{
+	"name": "glGenFramebuffers",
+	"cname": "glGenFramebuffers",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "n",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "framebuffers",
+			   "type": {"name": "GLuint*", "tag": "p"}}
+			]
+},
+{
+	"name": "glFramebufferTexture2D",
+	"cname": "glFramebufferTexture2D",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "attachment",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "textarget",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "texture",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "level",
+			   "type": {"name": "GLint", "tag": "i"}}
+			]
+},
+{
+	"name": "glCheckFramebufferStatus",
+	"cname": "glCheckFramebufferStatus",
+	"ret": {"name": "GLenum", "tag": "i"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}}]
+},
+{
+	"name": "glTexImage2D",
+	"cname": "glTexImage2D",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "level",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "internalformat",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "width",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "height",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "border",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "format",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "type",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "data",
+			   "type": {"name": "void*", "tag": "p"}}
+			]
+},
+{
+	"name": "glTexParameteri",
+	"cname": "glTexParameteri",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "pname",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "param",
+			   "type": {"name": "GLint", "tag": "i"}}
+			]
+},
+{
+	"name": "glBindBuffer",
+	"cname": "glBindBuffer",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "buffer",
+			   "type": {"name": "GLuint", "tag": "i"}}
+			]
+},
+{
+	"name": "glBufferData",
+	"cname": "glBufferData",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "target",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "size",
+			   "type": {"name": "GLsizeiptr", "tag": "i"}},
+			  {"name": "data",
+			   "type": {"name": "void*", "tag": "p"}},
+			  {"name": "usage",
+			   "type": {"name": "GLenum", "tag": "i"}}
+			]
+},
+{
+	"name": "glUniform1i",
+	"cname": "glUniform1i",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v0",
+			   "type": {"name": "GLint", "tag": "i"}}
+			]
+},
+{
+	"name": "glUniform2i",
+	"cname": "glUniform2i",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v0",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v1",
+			   "type": {"name": "GLint", "tag": "i"}}
+			]
+},
+{
+	"name": "glUniform1f",
+	"cname": "glUniform1f",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v0",
+			   "type": {"name": "GLfloat", "tag": "f"}}
+			]
+},
+{
+	"name": "glUniform2f",
+	"cname": "glUniform2f",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v0",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "v1",
+			   "type": {"name": "GLfloat", "tag": "f"}}
+			]
+},
+{
+	"name": "glUniform3f",
+	"cname": "glUniform3f",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "v0",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "v1",
+			   "type": {"name": "GLfloat", "tag": "f"}},
+			  {"name": "v2",
+			   "type": {"name": "GLfloat", "tag": "f"}}
+			]
+},
+{
+	"name": "glUniformMatrix4fv",
+	"cname": "glUniformMatrix4fv",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "location",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "count",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "transpose",
+			   "type": {"name": "GLboolean", "tag": "i"}},
+			  {"name": "value",
+			   "type": {"name": "GLfloat*", "tag": "p"}}
+			]
+},
+{
+	"name": "glGetAttribLocation",
+	"cname": "glGetAttribLocation",
+	"ret": {"name": "GLint", "tag": "i"},
+	"args": [ {"name": "program",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "name",
+			   "type": {"name": "GLchar*", "tag": "p"}}
+			]
+},
+{
+	"name": "glGetUniformLocation",
+	"cname": "glGetUniformLocation",
+	"ret": {"name": "GLint", "tag": "i"},
+	"args": [ {"name": "program",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "name",
+			   "type": {"name": "GLchar*", "tag": "p"}}
+			]
+},
+
+{
+	"name": "glVertexAttribPointer",
+	"cname": "glVertexAttribPointer",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "index",
+			   "type": {"name": "GLuint", "tag": "i"}},
+			  {"name": "size",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "type",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "normalized",
+			   "type": {"name": "GLboolean", "tag": "i"}},
+			  {"name": "stride",
+			   "type": {"name": "GLsizei", "tag": "i"}},
+			  {"name": "pointer",
+			   "type": {"name": "void*", "tag": "p"}}
+			]
+},
+{
+	"name": "glEnableVertexAttribArray",
+	"cname": "glEnableVertexAttribArray",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "index",
+			   "type": {"name": "GLuint", "tag": "i"}}]
+},
+{
+	"name": "glDrawArrays",
+	"cname": "glDrawArrays",
+	"ret": {"name": "void", "tag": "v"},
+	"args": [ {"name": "mode",
+			   "type": {"name": "GLenum", "tag": "i"}},
+			  {"name": "first",
+			   "type": {"name": "GLint", "tag": "i"}},
+			  {"name": "count",
+			   "type": {"name": "GLsizei", "tag": "i"}}
+			]
+}
+]
diff --git a/src/main.c b/src/main.c
index 874681f..afcbce4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,7 +7,6 @@
 *****************************************************************/
 #include<stdio.h>
 #include<errno.h>
-#include<pthread.h>
 #include<math.h>
 
 #define MG_INCLUDE_GL_API
@@ -298,15 +297,15 @@ void orca_runtime_init(orca_runtime* runtime)
 	runtime->wasmMemory.ptr = mem_base_reserve(allocator, runtime->wasmMemory.reserved);
 }
 
-#include"bindgen_core_api.c"
+#include"core_api_bind_gen.c"
 #include"canvas_api_bind.c"
 #include"clock_api_bind_gen.c"
 #include"io_api_bind_gen.c"
 
-#include"bindgen_gles_api.c"
+#include"gles_api_bind_gen.c"
 #include"manual_gles_api.c"
 
-void* orca_runloop(void* user)
+i32 orca_runloop(void* user)
 {
 	orca_app* app = &__orcaApp;
 
@@ -328,7 +327,7 @@ void* orca_runloop(void* user)
 		               options);
 
 		mp_request_quit();
-		return((void*)-1);
+		return(-1);
 	}
 
 	fseek(file, 0, SEEK_END);
@@ -378,7 +377,7 @@ void* orca_runloop(void* user)
 		               options);
 
 		mp_request_quit();
-		return((void*)-1);
+		return(-1);
 	}
 
 	//NOTE: Find and type check event handlers.
@@ -473,7 +472,7 @@ void* orca_runloop(void* user)
 		               	options);
 
 			mp_request_quit();
-			return((void*)-1);
+			return(-1);
 		}
 	}
 
@@ -803,8 +802,7 @@ int main(int argc, char** argv)
 	mp_window_focus(app->window);
 	mp_window_center(app->window);
 
-	pthread_t runloopThread;
-	pthread_create(&runloopThread, 0, orca_runloop, 0);
+	mp_thread* runloopThread = mp_thread_create(orca_runloop, 0);
 
 	while(!mp_should_quit())
 	{
@@ -812,8 +810,7 @@ int main(int argc, char** argv)
 		//TODO: what to do with mem scratch here?
 	}
 
-	void* res;
-	pthread_join(runloopThread, &res);
+	mp_thread_join(runloopThread, NULL);
 
 	mg_canvas_destroy(app->canvas);
 	mg_surface_destroy(app->surface);