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4006
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1 /*
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2 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef _JVM_DTRACE_H_
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26 #define _JVM_DTRACE_H_
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27
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28 /*
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29 * Interface to dynamically turn on probes in Hotspot JVM. Currently,
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30 * this interface can be used to dynamically enable certain DTrace
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31 * probe points that are costly to have "always on".
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32 */
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33
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34 #ifdef __cplusplus
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35 extern "C" {
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36 #endif
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37
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38 #include <sys/types.h>
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39
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40
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41 struct _jvm_t;
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42 typedef struct _jvm_t jvm_t;
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43
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44
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45 /* Attach to the given JVM process. Returns NULL on failure.
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46 jvm_get_last_error() returns last error message. */
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47 jvm_t* jvm_attach(pid_t pid);
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48
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49 /* Returns the last error message from this library or NULL if none. */
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50 const char* jvm_get_last_error();
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51
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52 /* few well-known probe type constants for 'probe_types' param below */
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53
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54 #define JVM_DTPROBE_METHOD_ENTRY "method-entry"
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55 #define JVM_DTPROBE_METHOD_RETURN "method-return"
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56 #define JVM_DTPROBE_MONITOR_ENTER "monitor-contended-enter"
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57 #define JVM_DTPROBE_MONITOR_ENTERED "monitor-contended-entered"
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58 #define JVM_DTPROBE_MONITOR_EXIT "monitor-contended-exit"
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59 #define JVM_DTPROBE_MONITOR_WAIT "monitor-wait"
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60 #define JVM_DTPROBE_MONITOR_WAITED "monitor-waited"
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61 #define JVM_DTPROBE_MONITOR_NOTIFY "monitor-notify"
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62 #define JVM_DTPROBE_MONITOR_NOTIFYALL "monitor-notifyall"
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63 #define JVM_DTPROBE_OBJECT_ALLOC "object-alloc"
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64 #define JVM_DTPROBE_ALL "*"
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65
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66 /* Enable the specified DTrace probes of given probe types on
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67 * the specified JVM. Returns >= 0 on success, -1 on failure.
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68 * On success, this returns number of probe_types enabled.
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69 * On failure, jvm_get_last_error() returns the last error message.
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70 */
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71 int jvm_enable_dtprobes(jvm_t* jvm, int num_probe_types, const char** probe_types);
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72
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73 /* Note: There is no jvm_disable_dtprobes function. Probes are automatically
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74 * disabled when there are no more clients requiring those probes.
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75 */
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76
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77 /* Detach the given JVM. Returns 0 on success, -1 on failure.
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78 * jvm_get_last_error() returns the last error message.
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79 */
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80 int jvm_detach(jvm_t* jvm);
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81
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82 #ifdef __cplusplus
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83 }
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84 #endif
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85
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86 #endif /* _JVM_DTRACE_H_ */
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