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Add test for lock contention #25772

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Add test for lock contention #25772

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20 changes: 20 additions & 0 deletions test/test_other.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2662,6 +2662,26 @@ def test_remote_ports(self):
# Emdawnwebgpu uses C++ internally, so we use a cpp file here so emcc defaults to linking C++.
self.emcc('hello_world.cpp', ['--use-port=emdawnwebgpu'])

def test_port_lock_contention(self):
if config.FROZEN_CACHE:
self.skipTest("test doesn't work with frozen cache")
self.run_process([EMBUILDER, 'clear', '--wasm64', 'emdawnwebgpu'])
with cache.lock('clean port'):
utils.delete_dir(os.path.join(config.PORTS, 'emdawnwebgpu'))
create_file('CMakeLists.txt', '''
cmake_minimum_required(VERSION 3.16)
file(GLOB MY_SOURCES "*.c")
set(CMAKE_C_FLAGS "-sMEMORY64 --use-port=emdawnwebgpu")

add_library(cpp_lib ${CPP_LIBRARY_TYPE} ${MY_SOURCES})
''')
for i in range(100):
create_file(f'file{i}.c', f'int v{i} = {i};')
self.run_process([EMCMAKE, 'cmake', '-G', 'Ninja'])
# All of the the 100 subprocesses should attempt downlowd emdawnwebgpu, but only one
# will actually do it.
self.run_process(['ninja', '-v'])

@crossplatform
def test_external_ports_simple(self):
if config.FROZEN_CACHE:
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