example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint value is guaranteed to be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time, but it may change arbitrarily across system reboots or suspensions

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint value is guaranteed to be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time, but it may change arbitrarily across system reboots or suspensions

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint value is guaranteed to be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time, but it may change arbitrarily across system reboots or suspensions

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint value is guaranteed to be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time, but it may change arbitrarily across system reboots or suspensions

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint value is guaranteed to be monotonic (mod 2⁶⁴) while the system is running, and is unaffected by clock drift or changes to local calendar time, but it may change arbitrarily across system reboots or suspensions

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint according to the locale keyword d 1, 31 Day of the month with a minimum width H 0, 23 Hour (24-hour clock) with a minimum width M 0, 59 Minute with a minimum width S 0, 59 Second with a minimum width s

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint according to the locale keyword d 1, 31 Day of the month with a minimum width H 0, 23 Hour (24-hour clock) with a minimum width M 0, 59 Minute with a minimum width S 0, 59 Second with a minimum width s

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint allows garbage collection to run. Note that even though safepoints are fast (typically around 2 clock cycles), they can still degrade performance if called in a tight loop. Julia 1.4 This function

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint according to the locale keyword d 1, 31 Day of the month with a minimum width H 0, 23 Hour (24-hour clock) with a minimum width M 0, 59 Minute with a minimum width S 0, 59 Second with a minimum width s

example, the following calls the clock function from the standard C library on most Unix-derived systems: julia> t = @ccall clock()::Int32 2292761 julia> typeof(t) Int32 clock takes no arguments and returns UInt32 (Windows) wchar_t Cwchar_t Int32 (UNIX), UInt16 (Windows) @ccall ccall @ccall clock()::Int32 ccall(:clock, Int32, ()) @ccall f(a::Cint)::Cint ccall(:a, Cint, (Cint,), a) @ccall "mylib".f(a::Cint according to the locale keyword d 1, 31 Day of the month with a minimum width H 0, 23 Hour (24-hour clock) with a minimum width M 0, 59 Minute with a minimum width S 0, 59 Second with a minimum width s