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NCBI C++ ToolKit: src/app/netcache/srv_sync.cpp Source File

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res = syscall(SYS_futex, &

, FUTEX_WAIT, old_value,

,

, 0);

res = syscall(SYS_futex, &

, FUTEX_WAIT, old_value, &left_time,

, 0);

(spent_time >= timeout)

left_time -= spent_time;

syscall(SYS_futex, &

, FUTEX_WAKE, cnt_to_wake,

,

, 0);

EWaitResult WaitValueChange(int old_value)

Wait for futex's value to change (with and without timeout).

volatile int m_Value

Value of the futex.

int GetValue(void)

Read value of the futex.

EWaitResult

Type of result returned from WaitValueChange()

@ eWaitWokenUp

Thread was woken up by call to WakeUpWaiters() from another thread.

@ eValueChanged

Futex's value was changed in another thread before waiting was started.

@ eTimedOut

Method returned because total waiting time exceeded given timeout.

int WakeUpWaiters(int cnt_to_wake)

Wake up some threads waiting on this futex.

int AddValue(int cnt_to_add)

Atomically add some amount to futex's value.

void Unlock(void)

Unlock the mutex.

void Lock(void)

Lock the mutex.

CFutex m_Futex

Futex which is used as base for mutex implementation.

Class incorporating convenient methods to work with struct timespec.

static CSrvTime Current(void)

Exact current time with precision up to nanoseconds.

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

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