mirror of git://gcc.gnu.org/git/gcc.git
82 lines
3.5 KiB
Plaintext
82 lines
3.5 KiB
Plaintext
GNU Classpath Native State API - Version 0.99.1
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Written by Paul Fisher (rao@gnu.org)
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For all function calls, if an error occurs, such that `NULL' or a
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negative value is returned, it's very possible that an exception has
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been thrown from within the function. The exception is not cleared,
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and you are responsible for dealing with the thrown exception.
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High level API:
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For using the highlevel API, in all cases, OBJ must contain a `final
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int' field called "native_state", which has been previously set to the
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value of java.lang.System.identityHashCode(OBJ).
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Function: struct state_table * init_state_table (JNIEnv *ENV,
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jclass CLAZZ)
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Creates a state table of default size. Returns `NULL' on error.
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Function: struct state_table * init_state_table_with_size (JNIEnv *ENV,
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jclass CLAZZ,
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jint SIZE)
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Creates a state table, with a tablesize of SIZE. SIZE should
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always be prime. Returns `NULL' on error.
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Function: jint set_state (JNIEnv *ENV, jobject OBJ,
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struct state_table *TABLE, void *STATE)
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Associates STATE with OBJ, in TABLE. Returns 0 on success, and a
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negative value on failure. STATE must not be `NULL'. set_state is
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reentrant, and calls to set_state/get_state/remove_state_slot may be
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made at the same time.
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Function: void * get_state (JNIEnv *ENV, jobject OBJ,
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struct state_table *TABLE)
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Retrieves the state associated with OBJ, in TABLE. Returns `NULL'
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if no value is associated with OBJ, or if a failure occurs.
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get_state is reentrant, and calls to
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get_state/set_state/remove_state_slot may be made at the same time.
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Function: void * remove_state_slot (JNIEnv *ENV, jobject OBJ,
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struct state_table *TABLE)
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Removes the internal slot associated with OBJ, in TABLE. Returns a
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pointer to the C state if a state was associated with OBJ,
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otherwise, `NULL' is returned. After `remove_state' is called,
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`get_state' passing OBJ, will result in `NULL' being returned. This
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function is generally called in the `finalize' method of a class.
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remove_state_slot is reentrant, and calls to
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get_state/set_state/remove_state_slot may be made at the same time.
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Low level API:
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Function: void set_state_oid (JNIEnv *ENV, jobject LOCK,
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struct state_table *TABLE,
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jint OBJECT_ID, void *STATE)
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Associates STATE with OBJECT_ID, in TABLE. STATE must not be
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`NULL'. On entering, a lock is obtained on LOCK. On exiting, the
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lock is released.
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Function: void * get_state_oid (JNIEnv *ENV, jobject LOCK,
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struct state_table *TABLE,
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jint OBJECT_ID)
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Retrieves the state associated with OBJECT_ID, in TABLE. Returns
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`NULL' if no value is associated with OBJECT_ID. On entering, a
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lock is obtained on LOCK. On exiting, the lock is released.
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Function: void * remove_state_oid (JNIEnv *ENV, jobject LOCK,
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struct state_table *TABLE,
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jint OBJECT_ID)
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Removes the value associated with OBJECT_ID, in TABLE. Returns a
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pointer to the C state if a state was associated with OBJECT_ID,
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otherwise, `NULL' is returned. After `remove_state_oid' is called,
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`get_state_oid' passing OBJECT_ID, will result in `NULL' being
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returned. On entering, a lock is obtained on LOCK. On exiting, the
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lock is released.
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