flywithu/usb-serial-for-android
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Code Issues Releases Wiki Activity

improved error handling for read() with concurrent close() (#569)

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reworked previous solution from change 8b9ad7ef / v3.7.1 because closeInt() was not working any more
This commit is contained in:
Kai Morich 2024-06-02 09:51:19 +02:00
parent b1362416f0
commit b794092c81
1 changed files with 11 additions and 15 deletions
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26
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CommonUsbSerialPort.java
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@ -34,7 +34,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
protected final int mPortNumber;
// non-null when open()
protected UsbDeviceConnection mConnection = null;
protected UsbDeviceConnection mConnection;
protected UsbEndpoint mReadEndpoint;
protected UsbEndpoint mWriteEndpoint;
protected UsbRequest mUsbRequest;
@ -139,18 +139,18 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
if (mConnection == null) {
throw new IOException("Already closed");
}
UsbDeviceConnection connection = mConnection;
mConnection = null;
try {
mUsbRequest.cancel();
} catch(Exception ignored) {}
UsbRequest usbRequest = mUsbRequest;
mUsbRequest = null;
try {
usbRequest.cancel();
} catch(Exception ignored) {}
try {
closeInt();
} catch(Exception ignored) {}
try {
connection.close();
mConnection.close();
} catch(Exception ignored) {}
mConnection = null;
}
protected abstract void closeInt();
@ -163,7 +163,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
}
protected void testConnection(boolean full, String msg) throws IOException {
if(mConnection == null) {
if(mUsbRequest == null) {
throw new IOException("Connection closed");
}
if(!full) {
@ -187,9 +187,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
public int read(final byte[] dest, final int length, final int timeout) throws IOException {return read(dest, length, timeout, true);}
protected int read(final byte[] dest, int length, final int timeout, boolean testConnection) throws IOException {
if(mConnection == null) {
throw new IOException("Connection closed");
}
testConnection(false);
if(length <= 0) {
throw new IllegalArgumentException("Read length too small");
}
@ -240,9 +238,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
long startTime = MonotonicClock.millis();
length = Math.min(length, src.length);
if(mConnection == null) {
throw new IOException("Connection closed");
}
testConnection(false);
while (offset < length) {
int requestTimeout;
final int requestLength;
@ -295,7 +291,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
@Override
public boolean isOpen() {
return mConnection != null;
return mUsbRequest != null;
}
@Override