include/qemu/progress_meter.h

   1 /*
   2  * Helper functionality for some process progress tracking.
   3  *
   4  * Copyright (c) 2011 IBM Corp.
   5  * Copyright (c) 2012, 2018 Red Hat, Inc.
   6  * Copyright (c) 2020 Virtuozzo International GmbH
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #ifndef QEMU_PROGRESS_METER_H
  28 #define QEMU_PROGRESS_METER_H
  29
  30 #include "qemu/thread.h"
  31
  32 typedef struct ProgressMeter {
  33     /**
  34      * Current progress. The unit is arbitrary as long as the ratio between
  35      * current and total represents the estimated percentage
  36      * of work already done.
  37      */
  38     uint64_t current;
  39
  40     /** Estimated current value at the completion of the process */
  41     uint64_t total;
  42
  43     QemuMutex lock; /* protects concurrent access to above fields */
  44 } ProgressMeter;
  45
  46 void progress_init(ProgressMeter *pm);
  47 void progress_destroy(ProgressMeter *pm);
  48
  49 /* Get a snapshot of internal current and total values  */
  50 void progress_get_snapshot(ProgressMeter *pm, uint64_t *current,
  51                            uint64_t *total);
  52
  53 /* Increases the amount of work done so far by @done */
  54 void progress_work_done(ProgressMeter *pm, uint64_t done);
  55
  56 /* Sets how much work has to be done to complete to @remaining */
  57 void progress_set_remaining(ProgressMeter *pm, uint64_t remaining);
  58
  59 /* Increases the total work to do by @delta */
  60 void progress_increase_remaining(ProgressMeter *pm, uint64_t delta);
  61
  62 #endif /* QEMU_PROGRESS_METER_H */