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27 * Trace writing functions, used to trace calls in the current process.
30 #ifndef _TRACE_WRITER_LOCAL_HPP_
31 #define _TRACE_WRITER_LOCAL_HPP_
36 #include "os_thread.hpp"
37 #include "trace_writer.hpp"
42 extern const FunctionSig memcpy_sig;
43 extern const FunctionSig malloc_sig;
44 extern const FunctionSig free_sig;
45 extern const FunctionSig realloc_sig;
48 * A specialized Writer class, mean to trace the current process.
51 * - it creates a trace file based on the current process name
52 * - uses mutexes to allow tracing from multiple threades
53 * - flushes the output to ensure the last call is traced in event of
54 * abnormal termination
56 class LocalWriter : public Writer {
59 * This mutex guarantees that only one thread writes to the trace file
60 * at one given instance.
62 * We need a recursive mutex so that we dont't dead lock in the event
63 * of a segfault happens while the mutex is held.
65 * To prevent deadlocks, the call for the real function (the one being
66 * traced) should not be done with the mutex held. That is, it should
67 * be done outside the beginEnter/endEnter and beginLeave/endLeave
68 * pairs. Preferably between these two pairs.
70 os::recursive_mutex mutex;
75 * Should never called directly -- use localWriter singleton below
84 * It will acquire the mutex.
86 unsigned beginEnter(const FunctionSig *sig, bool fake = false);
89 * It will release the mutex.
94 * It will acquire the mutex.
96 void beginLeave(unsigned call);
99 * It will release the mutex.
109 extern LocalWriter localWriter;
111 } /* namespace trace */
113 #endif /* _TRACE_WRITER_LOCAL_HPP_ */