UserSpaceThread/user_thread_api.cpp at main · ddeka0/UserSpaceThread · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
/**
 * @file user_thread.cpp
 * @author d.deka (https://ddeka0.github.io/)
 * @brief
 * @version 0.1
 * @date 2021-02-14
 *
 */
#include "user_thread_api.hpp"
#include "threadCtx.hpp"
#include "logger.hpp"
#include "config.hpp"
#include <thread>
#include <unordered_map>

/** u_yield_to(ThreadCtx* nextThread)
 * @brief
 *  Current pthread yields control to a user space thread
 * @param nextThread
 *  next thread context to load from
 * @return true
 *  Context Switch is done properly
 * @return false
 *  Error while context switch
 */
bool u_yield_to(ThreadCtx* nextThread) {
	PrintF

    currContext[KTHREAD]->setState(uState::READY);
    auto currRegCtx = currContext[KTHREAD]->getRegCtxPtr();
    nextThread->setState(uState::RUNNING);

    auto nextRegCtx = nextThread->getRegCtxPtr();

    currContext[UTHREAD] = nextThread;

    Log("Calling ContextSwitch");

	ContextSwitch(currRegCtx,nextRegCtx);

    Log("TID = ",THIS_THREAD_ID);

	return true;
}

/** u_yield()
 * @brief
 * An user thread is going to yield to a pthread
 * @return true
 * @return false
 */
bool u_yield() {
	PrintF

    currContext[UTHREAD]->setState(uState::READY);
    auto currRegCtx = currContext[UTHREAD]->getRegCtxPtr();

    currContext[KTHREAD]->setState(uState::RUNNING);

    auto nextRegCtx = currContext[KTHREAD]->getRegCtxPtr();


    Log("Calling ContextSwitch");

	ContextSwitch(currRegCtx,nextRegCtx);

    Log("TID = ",THIS_THREAD_ID);

	return true;
}

/** u_stop()
 * @brief
 * Marks the end of this user space thread and yield to a pthread
 */
void u_stop() {
    PrintF;

    currContext[UTHREAD]->setState(uState::COMPLETE);

    auto currRegCtx = currContext[UTHREAD]->getRegCtxPtr();

    currContext[KTHREAD]->setState(uState::RUNNING);

    auto nextRegCtx = currContext[KTHREAD]->getRegCtxPtr();


    Log("Calling ContextSwitch");

	ContextSwitch(currRegCtx,nextRegCtx);

    Log("TID = ",THIS_THREAD_ID);

}