Class named_condition

• boost::interprocess::named_condition

簡(jiǎn)介

// In header: <boost/interprocess/sync/named_condition.hpp>class named_condition { public:// construct/copy/destructnamed_condition(create_only_t, const char *, const permissions & = permissions());named_condition(open_or_create_t, const char *, const permissions & = permissions());named_condition(open_only_t, const char *);~named_condition();// public member functions*void notify_one();void notify_all();template<typename L> void wait(L &);template<typename L, typename Pr> void wait(L &, Pr);template<typename L> bool timed_wait(L &, const boost::posix_time::ptime &);template<typename L, typename Pr> bool timed_wait(L &, const boost::posix_time::ptime &, Pr);// public static functionsstatic bool remove(const char *); };

Description

• A global condition variable that can be created by name. This condition variable is designed to work with?named_mutex?and can't be placed in shared memory or memory mapped files.
• 一個(gè)全局條件變量，可以通過(guò)名字來(lái)創(chuàng)建。這個(gè)條件變量被設(shè)計(jì)成與named_mutex一起工作，不能放在共享內(nèi)存或內(nèi)存映射文件中。

named_condition?public construct/copy/destruct

• named_condition(create_only_t create_only, const char * name, const permissions & perm = permissions());
• Creates a global condition with a name. If the condition can't be created throws?interprocess_exception
• 創(chuàng)建一個(gè)帶有名稱的全局條件。如果條件不能被創(chuàng)建，則拋出interprocess_exception。

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• named_condition(open_or_create_t open_or_create, const char * name,
  const permissions & perm = permissions());
• Opens or creates a global condition with a name. If the condition is created, this call is equivalent to named_condition(create_only_t, ... ) If the condition is already created, this call is equivalent named_condition(open_only_t, ... ) Does not throw
• 打開(kāi)或創(chuàng)建一個(gè)帶有名稱的全局條件。如果條件已經(jīng)創(chuàng)建，這個(gè)調(diào)用相當(dāng)于 named_condition(create_only_t, ... ) 如果條件已經(jīng)創(chuàng)建，這個(gè)調(diào)用相當(dāng)于 named_condition(open_only_t, ... ) 不拋出

?

• named_condition(open_only_t open_only, const char * name);
• Opens a global condition with a name if that condition is previously created. If it is not previously created this function throws?interprocess_exception.
• 如果之前創(chuàng)建了一個(gè)帶有名稱的全局條件，則打開(kāi)該條件。如果之前沒(méi)有創(chuàng)建，則該函數(shù)會(huì)引發(fā)interprocess_exception。

?

• ~named_condition();
• Destroys *this and indicates that the calling process is finished using the resource. The destructor function will deallocate any system resources allocated by the system for use by this process for this resource. The resource can still be opened again calling the open constructor overload. To erase the resource from the system use remove().
• 銷毀*this，并表示調(diào)用進(jìn)程使用該資源結(jié)束。該破壞函數(shù)將去分配系統(tǒng)為該資源分配的任何系統(tǒng)資源，供該進(jìn)程使用。該資源仍然可以調(diào)用open構(gòu)造函數(shù)重載再次打開(kāi)。要從系統(tǒng)中刪除資源，使用remove()。

named_condition?public member functions?

• *void notify_one();
• If there is a thread waiting on *this, change that thread's state to ready. Otherwise there is no effect.
• 如果有一個(gè)線程在等待*this，則將該線程的狀態(tài)改為ready。否則沒(méi)有任何影響。

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• void notify_all();
• Change the state of all threads waiting on *this to ready. If there are no waiting threads, notify_all() has no effect.
• 將所有在*this上等待的線程的狀態(tài)改為ready。如果沒(méi)有等待的線程，notify_all()就沒(méi)有效果。

?

• template<typename L> void wait(L & lock);
• Releases the lock on the?named_mutex?object associated with lock, blocks the current thread of execution until readied by a call to this->notify_one() or this->notify_all(), and then reacquires the lock.
• 釋放與鎖相關(guān)聯(lián)的named_mutex對(duì)象的鎖，阻止當(dāng)前線程的執(zhí)行，直到調(diào)用this->notify_one()或this->notify_all()準(zhǔn)備好，然后重新獲取鎖。

?

• template<typename L, typename Pr> void wait(L & lock, Pr pred);
• The same as: while (!pred()) wait(lock)

?

• template<typename L>?bool timed_wait(L & lock, const boost::posix_time::ptime & abs_time);
• Releases the lock on the?named_mutex?object associated with lock, blocks the current thread of execution until readied by a call to this->notify_one() or this->notify_all(), or until time abs_time is reached, and then reacquires the lock. Returns: false if time abs_time is reached, otherwise true.
• 釋放與鎖相關(guān)聯(lián)的named_mutex對(duì)象的鎖，阻止當(dāng)前線程的執(zhí)行，直到調(diào)用this->notify_one()或this->notify_all()，或者直到達(dá)到時(shí)間abs_time，然后重新獲取鎖。返回：如果達(dá)到時(shí)間abs_time，則返回false，否則返回true。

?

• template<typename L, typename Pr>bool timed_wait(L & lock, const boost::posix_time::ptime & abs_time, Pr pred);
• The same as: while (!pred()) { if (!timed_wait(lock, abs_time)) return pred(); } return true;

named_condition?public static functions

• static bool remove(const char * name);
• Erases a named condition from the system. Returns false on error. Never throws.
• 從系統(tǒng)中刪除一個(gè)命名的條件。錯(cuò)誤時(shí)返回false。絕不拋出。
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