Usage for loop: as the declaration of the loop

Defined in header <time.h> struct timespec; (since C11) Structure holding an interval broken down into seconds and nanoseconds. Member objects time_t tv_sec whole seconds – >= 0 long tv_nsec nanoseconds – [0, 999999999] References C11 standard (ISO/IEC 9899:2011): 7.27.1/3 Components of time (p: 388) See also timespec_get (since C11) returns the calendar time based on a given time base (function) tm calendar time type (struct)

Defined in header <stdatomic.h> C atomic_load( const volatile A* obj ); (1) (since C11) C atomic_load_explicit( const volatile A* obj, memory_order order ); (2) (since C11) Atomically loads and returns the current value of the atomic variable pointed to by obj. The operation is atomic read operation. The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order. order must be one of memory_orde

Defined in header <stdarg.h> void va_start( va_list ap, parmN ); The va_start macro enables access to the variable arguments following the named argument parmN. va_start should be invoked with an instance to a valid va_list object ap before any calls to va_arg. If parmN is declared with register storage class specifier, with an array type, with a function type, or with a type not compatible with the type that results from default argument promotions, the behavior is undefin

Defined in header <wchar.h> int wcsncmp( const wchar_t* lhs, const wchar_t* rhs, size_t count ); (since C95) Compares at most count wide characters of two null-terminated wide strings. The comparison is done lexicographically. Parameters lhs, rhs - pointers to the null-terminated wide strings to compare count - maximum number of characters to compare Return value Negative value if lhs is less than rhs. ​0​ if lhs is equal to rhs. Positive value if lhs is

Defined in header <time.h> struct tm; Structure holding a calendar date and time broken down into its components. Member objects int tm_sec seconds after the minute – [0, 61](until C99) / [0, 60] (since C99)[note 1] int tm_min minutes after the hour – [0, 59] int tm_hour hours since midnight – [0, 23] int tm_mday day of the month – [1, 31] int tm_mon months since January – [0, 11] int tm_year years since 1900 int tm_wday days since Sunday – [0,

Defined in header <stdatomic.h> typedef /* unspecified */ atomic_flag; (since C11) atomic_flag is an atomic boolean type. Unlike other atomic types, it is guaranteed to be lock-free. Unlike atomic_bool, atomic_flag does not provide load or store operations. References C11 standard (ISO/IEC 9899:2011): 7.17.1/4 atomic_flag (p: 273) 7.17.8 Atomic flag type and operations (p: 285-286)

Defined in header <stdatomic.h> A kill_dependency(A y); (since C11) Informs the compiler that the dependency tree started by an memory_order_consume atomic load operation does not extend past the return value of kill_dependency; that is, the argument does not carry a dependency into the return value. The function is implemented as a macro. A is the type of y. Parameters y - the expression whose return value is to be removed from a dependency tree Return value

Defined in header <locale.h> lconv* localeconv(); The localeconv function obtains a pointer to a static object of type lconv, which represents numeric and monetary formatting rules of the current C locale. Parameters (none). Return value pointer to the current lconv object. Notes Modifying the object references through the returned pointer is undefined behavior. localeconv modifies a static object, calling it from different threads without synchronization is undefi

Defined in header <stddef.h> typedef /*implementation-defined*/ max_align_t; (since C11) max_align_t is a type whose alignment requirement is at least as strict (as large) as that of every scalar type. Notes Pointers returned by allocation functions such as malloc are suitably aligned for any object, which means they are aligned at least as strict as max_align_t. max_align_t is usually synonymous with the largest scalar type, which is long double on most platforms, and i