vmsvga: don't process more than 1024 fifo commands at once
[qemu.git] / trace / simple.h
1 /*
2 * Simple trace backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2. See
7 * the COPYING file in the top-level directory.
8 *
9 */
10
11 #ifndef TRACE_SIMPLE_H
12 #define TRACE_SIMPLE_H
13
14
15 #include "trace/generated-events.h"
16
17
18 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
19 void st_set_trace_file_enabled(bool enable);
20 void st_set_trace_file(const char *file);
21 bool st_init(void);
22 void st_flush_trace_buffer(void);
23
24 typedef struct {
25 unsigned int tbuf_idx;
26 unsigned int rec_off;
27 } TraceBufferRecord;
28
29 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */
30 #define MAX_TRACE_STRLEN 512
31 /**
32 * Initialize a trace record and claim space for it in the buffer
33 *
34 * @arglen number of bytes required for arguments
35 */
36 int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen);
37
38 /**
39 * Append a 64-bit argument to a trace record
40 */
41 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val);
42
43 /**
44 * Append a string argument to a trace record
45 */
46 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen);
47
48 /**
49 * Mark a trace record completed
50 *
51 * Don't append any more arguments to the trace record after calling this.
52 */
53 void trace_record_finish(TraceBufferRecord *rec);
54
55 #endif /* TRACE_SIMPLE_H */