Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
|
-
Property svn:eol-style
set to
native
-
Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
|
File size:
830 bytes
|
Line | |
---|
1 | #include "stdio_impl.h"
|
---|
2 | #include "pthread_impl.h"
|
---|
3 |
|
---|
4 | int __lockfile(FILE *f)
|
---|
5 | {
|
---|
6 | int owner, tid = __pthread_self()->tid;
|
---|
7 | if (f->lock == tid)
|
---|
8 | return 0;
|
---|
9 | while ((owner = a_cas(&f->lock, 0, tid)))
|
---|
10 | __wait(&f->lock, &f->waiters, owner, 1);
|
---|
11 | return 1;
|
---|
12 | }
|
---|
13 |
|
---|
14 | void __unlockfile(FILE *f)
|
---|
15 | {
|
---|
16 | a_store(&f->lock, 0);
|
---|
17 |
|
---|
18 | /* The following read is technically invalid under situations
|
---|
19 | * of self-synchronized destruction. Another thread may have
|
---|
20 | * called fclose as soon as the above store has completed.
|
---|
21 | * Nonetheless, since FILE objects always live in memory
|
---|
22 | * obtained by malloc from the heap, it's safe to assume
|
---|
23 | * the dereferences below will not fault. In the worst case,
|
---|
24 | * a spurious syscall will be made. If the implementation of
|
---|
25 | * malloc changes, this assumption needs revisiting. */
|
---|
26 |
|
---|
27 | if (f->waiters) __wake(&f->lock, 1, 1);
|
---|
28 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.