87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
# Test VfsFat class and its finaliser
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try:
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import errno, os
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os.VfsFat
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except (ImportError, AttributeError):
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print("SKIP")
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raise SystemExit
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class RAMBlockDevice:
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def __init__(self, blocks, sec_size=512):
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self.sec_size = sec_size
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self.data = bytearray(blocks * self.sec_size)
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def readblocks(self, n, buf):
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for i in range(len(buf)):
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buf[i] = self.data[n * self.sec_size + i]
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def writeblocks(self, n, buf):
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for i in range(len(buf)):
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self.data[n * self.sec_size + i] = buf[i]
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def ioctl(self, op, arg):
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if op == 4: # MP_BLOCKDEV_IOCTL_BLOCK_COUNT
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return len(self.data) // self.sec_size
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if op == 5: # MP_BLOCKDEV_IOCTL_BLOCK_SIZE
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return self.sec_size
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# Create block device, and skip test if not enough RAM
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try:
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import errno, os
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bdev = RAMBlockDevice(50)
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except MemoryError:
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print("SKIP")
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raise SystemExit
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# Format block device and create VFS object
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os.VfsFat.mkfs(bdev)
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vfs = os.VfsFat(bdev)
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# Here we test that opening a file with the heap locked fails correctly. This
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# is a special case because file objects use a finaliser and allocating with a
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# finaliser is a different path to normal allocation. It would be better to
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# test this in the core tests but there are no core objects that use finaliser.
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import micropython
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micropython.heap_lock()
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try:
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import errno, os
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vfs.open("x", "r")
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except MemoryError:
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print("MemoryError")
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micropython.heap_unlock()
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# Here we test that the finaliser is actually called during a garbage collection.
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import gc
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# Preallocate global variables, and list of filenames for the test (which may
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# in turn allocate new qstrs and/or a new qstr pool).
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f = None
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n = None
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names = ["x%d" % i for i in range(5)]
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# Do a large number of single-block allocations to move the GC head forwards,
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# ensuring that the files are allocated from never-before-used blocks and
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# therefore couldn't possibly have any references to them left behind on
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# the stack.
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for i in range(1024):
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[]
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# Run the test: create files without closing them, run GC, then read back files.
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# Only read back N-1 files because the last one may not be finalised due to
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# references to it being left on the C stack.
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for n in names:
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f = vfs.open(n, "w")
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f.write(n)
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f = None # release f without closing
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gc.collect() # should finalise at least the first N-1 files by closing them
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for n in names[:-1]:
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with vfs.open(n, "r") as f:
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print(f.read())
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