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Fixed deadlock on sharedClient during shutdown

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This commit is contained in:
Thulinma 2017-12-13 10:53:39 +01:00
parent b3cdf34fbc
commit 9f9c67b07e
1 changed files with 25 additions and 22 deletions
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47
lib/shared_memory.cpp
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@ -1141,38 +1141,41 @@ namespace IPC {
}
memset(empty, 0, payLen);
}
while (offsetOnPage == -1) {
{
for (char i = 'A'; i <= 'Z'; i++) {
myPage.init(baseName.substr(1) + i, (4096 << (i - 'A')), false, false);
if (!myPage.mapped) {
break;
}
int offset = 0;
while (offset + payLen + (hasCounter ? 1 : 0) <= myPage.len) {
uint32_t attempts = 0;
while (offsetOnPage == -1 && (++attempts) < 20) {
for (char i = 'A'; i <= 'Z'; i++) {
myPage.init(baseName.substr(1) + i, (4096 << (i - 'A')), false, false);
if (!myPage.mapped) {
break;
}
int offset = 0;
while (offset + payLen + (hasCounter ? 1 : 0) <= myPage.len) {
if ((hasCounter && myPage.mapped[offset] == 0) || (!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))) {
semGuard tmpGuard(&mySemaphore);
if ((hasCounter && myPage.mapped[offset] == 0) || (!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))) {
semGuard tmpGuard(&mySemaphore);
if ((hasCounter && myPage.mapped[offset] == 0) || (!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))) {
offsetOnPage = offset;
if (hasCounter) {
myPage.mapped[offset] = 1;
*((uint32_t *)(myPage.mapped + 1 + offset + len - 4)) = getpid();
HIGH_MSG("sharedClient received ID %d", offsetOnPage/(payLen+1));
}
break;
offsetOnPage = offset;
if (hasCounter) {
myPage.mapped[offset] = 1;
*((uint32_t *)(myPage.mapped + 1 + offset + len - 4)) = getpid();
HIGH_MSG("sharedClient received ID %d", offsetOnPage/(payLen+1));
}
break;
}
offset += payLen + (hasCounter ? 1 : 0);
}
if (offsetOnPage != -1) {
break;
}
offset += payLen + (hasCounter ? 1 : 0);
}
if (offsetOnPage != -1) {
break;
}
}
if (offsetOnPage == -1) {
Util::wait(500);
}
}
if (offsetOnPage == -1){
FAIL_MSG("Could not register on page for %s", baseName.c_str());
myPage.close();
}
if (empty) {
free(empty);
}