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Shared memory fixes.

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This commit is contained in:
Thulinma 2014-06-16 14:41:00 +02:00
parent 0cf74425f9
commit 19e79c1315
1 changed files with 34 additions and 63 deletions
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67
lib/shared_memory.cpp
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@ -177,27 +177,31 @@ namespace IPC {
///\brief Unmaps a shared page if allowed
void sharedPage::unmap() {
if (mapped && len) {
#ifdef __CYGWIN__
#ifdef __CYGWIN__
UnmapViewOfFile(mapped);
#else
#else
munmap(mapped, len);
#endif
}
#endif
mapped = 0;
len = 0;
}
}
///\brief Closes a shared page if allowed
void sharedPage::close() {
unmap();
if (handle > 0) {
#ifdef __CYGWIN__
#ifdef __CYGWIN__
CloseHandle(handle);
#else
#else
::close(handle);
#endif
if (master && name != "") {
shm_unlink(name.c_str());
}
#endif
handle = 0;
}
}
///brief Creates a shared page
@ -205,12 +209,7 @@ namespace IPC {
///\param len_ The size to make the page
///\param master_ Whether to create or merely open the page
///\param autoBackoff When only opening the page, wait for it to appear or fail
sharedPage::sharedPage(std::string name_, unsigned int len_, bool master_, bool autoBackoff) : handle(0), name(name_), len(len_), master(master_), mapped(NULL) {
handle = 0;
name = name_;
len = len_;
master = master_;
mapped = 0;
sharedPage::sharedPage(std::string name_, unsigned int len_, bool master_, bool autoBackoff) : handle(0), len(0), master(false), mapped(0) {
init(name_, len_, master_, autoBackoff);
}
@ -218,7 +217,6 @@ namespace IPC {
///\param rhs The page to copy
sharedPage::sharedPage(const sharedPage & rhs) {
handle = 0;
name = "";
len = 0;
master = false;
mapped = 0;
@ -237,20 +235,19 @@ namespace IPC {
}
#ifdef __CYGWIN__
///\brief Initialize a page, de-initialize before if needed
///\param name_ The name of the page to be created
///\param len_ The size to make the page
///\param master_ Whether to create or merely open the page
///\param autoBackoff When only opening the page, wait for it to appear or fail
void sharedPage::init(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
unmap();
close();
name = name_;
len = len_;
master = master_;
mapped = 0;
if (name.size()) {
#ifdef __CYGWIN__
if (master){
handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, len, name.c_str());
}else{
@ -271,25 +268,7 @@ namespace IPC {
if (!mapped) {
return;
}
}
}
#else
///\brief Initialize a page, de-initialize before if needed
///\param name_ The name of the page to be created
///\param len_ The size to make the page
///\param master_ Whether to create or merely open the page
///\param autoBackoff When only opening the page, wait for it to appear or fail
void sharedPage::init(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
unmap();
if (master) {
shm_unlink(name.c_str());
}
close();
name = name_;
len = len_;
master = master_;
mapped = 0;
if (name.size()) {
handle = shm_open(name.c_str(), (master ? O_CREAT | O_EXCL : 0) | O_RDWR, ACCESSPERMS);
if (handle == -1) {
if (master) {
@ -330,18 +309,12 @@ namespace IPC {
mapped = 0;
return;
}
}
}
#endif
}
}
///\brief Default destructor
sharedPage::~sharedPage() {
unmap();
if (master) {
#ifndef __CYGWIN__
shm_unlink(name.c_str());
#endif
}
close();
}
@ -354,9 +327,8 @@ namespace IPC {
///\param autoBackoff When only opening the page, wait for it to appear or fail
sharedPage::sharedPage(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
handle = 0;
name = name_;
len = len_;
master = master_;
len = 0;
master = false;
mapped = 0;
init(name_, len_, master_, autoBackoff);
}
@ -365,7 +337,6 @@ namespace IPC {
///\param rhs The page to copy
sharedPage::sharedPage(const sharedPage & rhs) {
handle = 0;
name = "";
len = 0;
master = false;
mapped = 0;
@ -375,10 +346,10 @@ namespace IPC {
///\brief Default destructor
sharedPage::~sharedPage() {
unmap();
if (master) {
close(handle);
if (master && name != "") {
unlink(name.c_str());
}
close(handle);
}
#endif